# Hayan HVACR

> Air filtration products manufacturer and supplier in Surat, Gujarat, India. Made-to-drawing manufacturing and supply across four categories: the main line is Air Filtration Products (33 products: washable and pleated pre-filters, fine and bag filters, H13/H14 HEPA, EPA and activated carbon), alongside Air Distribution Products (24: grilles, diffusers, jet nozzles, louvers), Air Control Products (9: dampers for volume, fire, smoke and balancing duty) and Other HVAC Air Products (7: fresh air and gravity louvers, risers, plenums, flexible ducts). Shipped pan-India.

Key facts:

- Legal name: Hayan HVACR Engineering; brand: Hayan HVACR
- Works: Surat, Gujarat, India
- Phone / WhatsApp: +91 81559 88788 or +91 81560 77177
- Email: hayanhvac@gmail.com
- Hours: Monday to Saturday, 10:00 AM to 7:00 PM IST
- Scale: 73 catalogue products across four categories, all made to drawing in the Surat plant
- Every product is made to drawing, including custom sizes; any RAL powder-coat finish

## Air Filtration Products

- [Air Filtration Products category page](https://hayanhvac.com/products/air-filtration-solutions): Capturing airborne particles, dust and contaminants to protect indoor air quality, and everything downstream of the filter bank.
- [Diamond Nylon Mesh Pre Air Filter (HHE/DMF-RT)](https://hayanhvac.com/products/nylon-mesh-filter): Washable nylon mesh pre-filters (Diamond HHE/DMF, B-Star HHE/BSF) for AHUs, FCUs and commercial AC: MERV 1–4 coarse-stage dust hold-down, aluminium frames, custom sizes from a Surat manufacturer and supplier.
- [B-Star Nylon Mesh FCU Pre Air Filter (HHE/BSF-RT)](https://hayanhvac.com/products/b-star-nylon-mesh-fcu-filter): B-Star nylon mesh FCU pre filters (HHE/BSF-RT / BSF-BT): washable coarse-stage dust protection sized to fan coil unit casings. Aluminium frames, custom sizes from a Surat manufacturer.
- [Eakon Indoor Dust Filter: 10/20 Micron (HHE/EIDF-W)](https://hayanhvac.com/products/eakon-indoor-dust-filter): Eakon indoor dust filters (HHE/EIDF-W / EIDF-B) at 10 and 20 micron grades: washable and box formats cut to indoor AC unit filter channels.
- [Advance FCU Flat Panel Box Filter: 10/20 Micron (HHE/AFPF-G2)](https://hayanhvac.com/products/disposable-panel-filter): Disposable panel filters (Advance HHE/AFPF) in G2–G4 coarse grades, synthetic media on wire grid, beverage-board or GI frames. Standard and custom sizes for residential and light-commercial HVAC.
- [V-Swas FCU Pre Air Box Filter: 10/20 Micron (RT) (HHE/VPBF-RT)](https://hayanhvac.com/products/washable-panel-filter): Washable panel filters (V-Swas HHE/VPBF), EN 779 G3–G4 coarse, in riveted aluminium frames. Reusable panels for FCUs, package units and return air, custom sizes from a Surat manufacturer.
- [V-Swas FCU Pre Air Box Filter: 10/20 Micron (PT) (HHE/VPBF-PT)](https://hayanhvac.com/products/v-swas-box-filter-pt): V-Swas panel-type (PT) pre air box filters (HHE/VPBF-PT / VPFF-PT): progressive pad media in rigid frames, washable, for FCU and return-air coarse stages.
- [Accurate AHU Pre Air Filter: 10/20 Micron (PT) (HHE/APAF-BT-PT)](https://hayanhvac.com/products/pleated-pre-filter): MERV 8 pleated pre-filters (Accurate HHE/APAF) with deep-pleat synthetic media for AHU first stages and commercial HVAC. ePM10 50%, GI/aluminium frames, custom sizes from a Surat manufacturer and supplier.
- [Accurate AHU Pre Air Filter: 10/10 Micron (RT) (HHE/APAF-BT-RT)](https://hayanhvac.com/products/accurate-ahu-pre-filter-rt): Accurate rod-type AHU pre air filters (HHE/APAF-BT-RT / APAF-FT-RT) with matched 10/10 micron media on both faces for even dust loading.
- [Kaizen Microvee AHU Fine Air Filter: 5 Micron (M5) (HHE/KFAF-BT-M5)](https://hayanhvac.com/products/microvee-fine-filter): Microvee fine filters (Kaizen HHE/KFAF): rigid deep-pleat MERV 13–14 (ePM1 60–80%) dust collection for AHU second stages, pharma HVAC and offices. GI/aluminium, Surat-made.
- [Kaizen Microvee AHU Fine Air Filter: 5 Micron (M6) (HHE/KFAF-BT-M6)](https://hayanhvac.com/products/microvee-fine-filter-m6): Kaizen Microvee AHU fine air filters at M6 (HHE/KFAF-BT-M6 / KFAF-FT-M6): rigid deep-pleat 5 micron filtration for demanding AHU second stages.
- [Kaizen Microvee AHU Fine Air Filter: 3 Micron (F7) (HHE/KFAF-BT-F7)](https://hayanhvac.com/products/microvee-fine-filter-f7): Kaizen Microvee AHU fine air filters at F7 (HHE/KFAF-BT-F7 / KFAF-FT-F7): 3 micron fine filtration for pharma supply air and commercial AHUs.
- [Kaizen Microvee AHU Fine Air Filter: 1 Micron (F8) (HHE/KFAF-BT-F8)](https://hayanhvac.com/products/microvee-fine-filter-f8): Kaizen Microvee AHU fine air filters at F8 (HHE/KFAF-BT-F8 / KFAF-FT-F8): 1 micron fine filtration, the last stage before HEPA in a staged train.
- [Pocketto Bag Pre Air Filter: 10 Micron (G4) (HHE/PPBF-BT-G4)](https://hayanhvac.com/products/bag-filter): Multi-pocket bag filters (Pocketto HHE/PPBF–PSFBF), MERV 11–15 / ePM1 50–85%, progressive-density media in galvanized frames for large-airflow AHUs, paint booths and hospitals.
- [Pocketto Bag Medium Filter: 5 Micron (M5) (HHE/PMBF-BT-M5)](https://hayanhvac.com/products/bag-medium-filter): Pocketto bag medium filters (HHE/PMBF-BT-M5 / PMBF-FT-M5): 5 micron pocket filtration bridging pre and fine stages in high-airflow AHUs.
- [Pocketto Bag Fine Filter: 3 Micron (F7) (HHE/PFBF-BT-F7)](https://hayanhvac.com/products/bag-fine-filter): Pocketto bag fine filters (HHE/PFBF-BT-F7 / PFBF-FT-F7): 3 micron pocket filtration with kilograms of dust holding for large AHUs.
- [Pocketto Bag Super Fine Filter: 0.3 Micron (F9) (HHE/PSFBF-BT-F9)](https://hayanhvac.com/products/bag-super-fine-filter): Pocketto bag super fine filters (HHE/PSFBF-BT-F9 / PSFBF-FT-F9): 0.3 micron pocket filtration, the finest stage before HEPA.
- [Semi HEPA Super Fine Filter: 0.3 Micron (F9) (HHE/SMHF-BT-F9)](https://hayanhvac.com/products/semi-hepa-filter): Semi HEPA super fine filters (HHE/SMHF-BT-F9 / SMHF-FT-F9): near-HEPA 0.3 micron capture in a sealed pack for laboratories, food zones and electronics air.
- [Deep Pleat EPA Super Fine Air Filter: 0.3 Micron (H10–H12) (HHE/DEPA-BT-H10-H12)](https://hayanhvac.com/products/deep-pleat-epa-filter): Deep pleat EPA super fine air filters (HHE/DEPA-BT-H10-H12): EN 1822 H10–H12, 95–99.5% at 0.3 µm, for ISO 8–9 cleanrooms and demanding supply air.
- [Mini Pleat EPA Super Fine Air Filter: 0.3 Micron (H10–H12) (HHE/MPEPA-BT-H10)](https://hayanhvac.com/products/mini-pleat-fine-filter): Mini-pleat fine filters (HAYAN EPA HHE/MPEPA) with thermally sealed media packs at ePM1 50–70% / MERV 13–14. Low initial pressure drop, slim frames, for AHU fine stages and pre-HEPA duty.
- [Deep Pleat HEPA Filter: 0.3 Micron (H13–H14) (HHE/DPHF-BT-H13-H14)](https://hayanhvac.com/products/hepa-filter): Deep-pleat HEPA filters (HAYAN HEPA HHE/DPHF) to EN 1822: H13 at 99.97% and H14 at 99.995% efficiency @ 0.3 µm, ultra-fine glass fibre, extruded aluminium frames, for cleanrooms, operation theatres and pharma. Manufactured and supplied from Surat.
- [High Flow HEPA Filter: 0.3 Micron (H13–H14) (HHE/HFHF-BT-H13-H14)](https://hayanhvac.com/products/high-flow-hepa-filter): High flow HEPA filters (HHE/HFHF-BT-H13-H14): full H13–H14 efficiency at elevated face velocities, for compact high-volume clean air banks.
- [High Temperature HEPA Filter: 0.3 Micron (H13–H14) (HHE/HTHF-BT-H13-H14)](https://hayanhvac.com/products/high-temperature-hepa-filter): High-temperature HEPA filters (HAYAN HEPA HHE/HTHF) rated to 250°C continuous: all-metal frame, inorganic separators, no organic adhesives. H13-class filtration for ovens and sterilization tunnels.
- [Mini Pleat HEPA Filter: 0.3 Micron (H13–H14) (HHE/MPHF-BT-H13-H14)](https://hayanhvac.com/products/mini-pleat-hepa-filter): Separator-less mini-pleat HEPA filters (HAYAN HEPA HHE/MPHF) at EN 1822 H13/H14: hot-melt media packs in anodized frames with gel seals, individually tested before dispatch. For cleanrooms and OTs.
- [Mini Pleat Gel Seal HEPA Filter: 0.3 Micron (H13–H14) (HHE/MPGF-BT-H13-H14)](https://hayanhvac.com/products/gel-seal-hepa-filter): Gel-seal HEPA filters (HAYAN HEPA HHE/MPGF): knife-edge frames sealing into non-drying gel channels for zero-bypass terminal filtration. EN 1822 H13/H14 for pharma ceiling modules and cleanrooms.
- [DuraMet Metal Wire Mesh Pre Filter: Aluminium (HHE/DMPF-BT-AL)](https://hayanhvac.com/products/metallic-mesh-filter): Expanded aluminium and stainless metallic mesh filters (DuraMet HHE/DMPF), MERV 4–6 coarse, for greasy kitchen exhaust, heavy dust and high-moisture air. Degreasable, reusable, GI frames.
- [DuraMet SS Wire Mesh Pre Filter: Stainless Steel (HHE/DMPF-BT-SS)](https://hayanhvac.com/products/ss-wire-mesh-filter): DuraMet stainless steel wire mesh pre filters (HHE/DMPF-BT-SS): corrosion-proof, wash-down-ready mesh for food plants, coastal sites and chemical duty.
- [Carbon Flat Panel Box Air Filter (HHE/CFPF-AL)](https://hayanhvac.com/products/carbon-panel-filter): Honeycomb carbon panel filters (HAF-CPF): activated carbon matrix in 8–20 mm panels that fit standard panel positions. Odour control for offices, toilets and FCU returns.
- [Activated Carbon Air Filter (HHE/ACAF-BT)](https://hayanhvac.com/products/carbon-filter): Activated carbon filters (Active Air HHE/ACAF) that adsorb odours, gases and VOCs: granular carbon in GI panel and cartridge formats for airports, laboratories and kitchen exhaust scrubbing.
- [Duet Combination Air Filter: G4 + M6 (HHE/DCAF-G4+M6)](https://hayanhvac.com/products/combination-filter-g4-m6): Duet combination air filters (HHE/DCAF-G4+M6): G4 pre media and M6 medium media in one frame, two-stage filtration for single-filter housings.
- [Duet Combination Air Filter: G4 + F7 (HHE/DCAF-G4+F7)](https://hayanhvac.com/products/combination-filter-g4-f7): Duet combination air filters (HHE/DCAF-G4+F7): coarse pre-filtration and F7 fine filtration combined in a single rigid pack.
- [Duet Combination Air Filter: G4 + F7 Bag (HHE/DCAF-G4+F7-BAG)](https://hayanhvac.com/products/combination-filter-g4-f7-bag): Duet combination bag filters (HHE/DCAF-G4+F7-BAG): G4 pre face with F7 fine pockets, the whole pre-plus-fine train in one assembly.
- [HEPA Terminal Housing Box (HHE/HTHB)](https://hayanhvac.com/products/hepa-terminal-housing-box): HEPA terminal housing boxes (HHE/HTHB): gas-tight housings with gel sealing and DOP test ports that turn a HEPA filter into a validated terminal.
- [Laminar Air Flow Plenum Box (HHE/LAFP)](https://hayanhvac.com/products/laminar-air-flow-plenum-box): Laminar air flow plenum boxes (HHE/LAFP): pressure-fed chambers that deliver uniform velocity across HEPA ceilings for OTs and cleanrooms.
## Air Distribution Products

- [Air Distribution Products category page](https://hayanhvac.com/products/air-distribution-products): Balanced delivery, diffusion and exhaust of conditioned air into the spaces people work in.
- [Aluminium Linear Slot Diffuser (HHE/ALSD-20)](https://hayanhvac.com/products/linear-slot-diffuser): Linear slot diffusers (AirVent HHE/ALSD-20): 1–4 slots with adjustable pattern controllers in anodized or coated extruded aluminium. Plaster-in and lay-in frames for premium interiors.
- [Aluminium Grid Ceiling Diffuser (HHE/AGCD)](https://hayanhvac.com/products/grid-ceiling-diffuser): Aluminium grid ceiling diffusers (HHE/AGCD / AGCD-D): grid-face lay-in terminals with even low-noise discharge for offices and commercial ceilings.
- [Aluminium Square Ceiling Diffuser (HHE/ASQD)](https://hayanhvac.com/products/ceiling-square-diffuser): Ceiling square diffusers (AirVent HHE/ASQD) with 1, 2, 3 or 4-way blow patterns, removable cores, plenum and damper options: the core terminal for suspended ceilings.
- [Aluminium Round - Circular Diffuser (HHE/ARCD)](https://hayanhvac.com/products/round-ceiling-diffuser): Round ceiling diffusers (HHE/ARCD) with concentric discharge cones: 360° radial patterns, fixed or adjustable cones, in aluminium. High-comfort zones and exposed-duct interiors.
- [Architectural Plaque Diffuser (HHE/APQD)](https://hayanhvac.com/products/plaque-diffuser): Architectural plaque diffusers (HHE/APQD / APQD-D): a clean disc on a radial slot of air, the architect's ceiling statement with diffuser performance.
- [Perforated Face Ceiling Diffuser (HHE/PFCD)](https://hayanhvac.com/products/perforated-diffuser): Perforated diffusers (HHE/PFCD): fine-hole faces that paint with the ceiling, backed by plenum geometry for full diffusion. Round, square and rectangular formats, low noise.
- [SS 304 Ceiling Air Diffuser (HHE/SSCD)](https://hayanhvac.com/products/ss-ceiling-diffuser): SS304 ceiling air diffusers (HHE/SSCD / SSCD-D): corrosion-proof, wash-down-ready terminals for kitchens, pharma and coastal plant.
- [Swirl Air Diffuser (HHE/ASWD)](https://hayanhvac.com/products/swirl-diffuser): Swirl diffusers (AirVent HHE/ASWD) with high induction ratios for rapid supply–room air mixing: variable-load commercial zones, offices and conference halls. Powder-coated steel/aluminium.
- [Airvent Eye Ball Jet Nozzle (HHE/AJN)](https://hayanhvac.com/products/jet-nozzle-diffuser): Jet nozzle diffusers (AirVent HHE/AJN) with throws up to 30 m and ±30° omnidirectional aim, manual or motorized. Aluminium nozzles for airports, auditoriums and high-ceiling halls.
- [Aluminium Spot Jet Nozzle Diffuser (HHE/SJN)](https://hayanhvac.com/products/ball-jet-diffuser): Ball-jet spot diffusers (HHE/SJN): aimable spheres in trim rings delivering tight short-throw air exactly where needed (theatre seats, control rooms and workstation islands).
- [Adjustable Multi Cone Jet Diffuser (HHE/AJD)](https://hayanhvac.com/products/adjustable-cone-diffuser): Multi-cone adjustable diffusers (HHE/AJD): stacked cones on a single carrier shift the pattern horizontal to vertical through the face. Season-change supply for halls and hotels.
- [Helical Swirl Jet Diffuser (HHE/HSD)](https://hayanhvac.com/products/helical-swirl-jet-diffuser): Helical swirl jet diffusers (HHE/HSD / HSD-GPB): angled vanes spin the jet for long throw with high induction, the high-ceiling terminal that mixes as it reaches.
- [Drum Louver Jet Diffuser (HHE/DJD)](https://hayanhvac.com/products/drum-jet-nozzle): Drum-type jet nozzles (HHE/DJD) in spherical housings with friction-locked aim: long-throw spot supply for factories, foundries and assembly halls. Wall, duct and stand mounting.
- [Exhaust Metal Disk Valve (HHE/MDV)](https://hayanhvac.com/products/metal-disk-valve): Exhaust metal disk valves (HHE/MDV): screw-adjustable spun cones over spigots, the set-and-forget exhaust terminal for toilets and small extracts.
- [Exhaust Aluminium Disk Valve (HHE/ADV)](https://hayanhvac.com/products/aluminium-disk-valve): Exhaust aluminium disk valves (HHE/ADV): light, corrosion-free adjustable exhaust terminals for finished interiors and coastal duty.
- [Exhaust PVC Disk Valve (HHE/PDV)](https://hayanhvac.com/products/pvc-disk-valve): Exhaust PVC disk valves (HHE/PDV): fully corrosion-proof adjustable exhaust terminals for chemical fume, ET plant and coastal duty.
- [Aluminium Linear Grille (HHE/ALG)](https://hayanhvac.com/products/linear-bar-grille): Linear bar grilles (AirVent HHE/ALG) with 0°, 15° or 30° fixed deflection in extruded aluminium: continuous perimeter runs, fan coil and sill enclosures. Egg-crate faces available.
- [Square Swirl Grille (HHE/SWG)](https://hayanhvac.com/products/square-swirl-grille): Square swirl grilles (HHE/SWG / SWG-D): fixed radial vanes behind a clean square face, swirl mixing for ceilings and walls in an architectural square.
- [Aluminium Curve Grille (HHE/ACG)](https://hayanhvac.com/products/curve-grille): Aluminium curve grilles (HHE/ACG / ACG-D): sculpted curved blades that direct air with a softer architectural line for feature sills and ceilings.
- [Adjustable Double Deflection Grille (HHE/DDG)](https://hayanhvac.com/products/double-deflection-grille): Double deflection grilles (AirVent HHE/DDG) with vertical and horizontal adjustable blades for precise directional supply air. Extruded aluminium, powder-coated, made to drawing in Surat.
- [Adjustable Single Deflection Grille (HHE/SDG)](https://hayanhvac.com/products/single-deflection-grille): Single deflection grilles (AirVent HHE/SDG): one set of adjustable blades in powder-coated extruded aluminium for side-wall supply and return air. Custom sizes, any RAL shade.
- [Curve Double Deflection Grille (HHE/CDG)](https://hayanhvac.com/products/curve-double-deflection-grille): Curve double deflection grilles (HHE/CDG / CDG-D): full vertical and horizontal aim with sculpted curved blades for design-led interiors.
- [Airvent Round Grille (HHE/ARG)](https://hayanhvac.com/products/round-grille): Airvent round grilles (HHE/ARG / ARG-D): radial vanes in a circular trim for round duct, exposed spigots and spiral-duct interiors.
- [Architectural Decorative Grille (HHE/ADG)](https://hayanhvac.com/products/decorative-grille): Architectural decorative grilles (HHE/ADG / ADG-D): pierced and patterned faces that move air while reading as interior design.
## Air Control Products

- [Air Control Products category page](https://hayanhvac.com/products/air-control-products): Regulating, balancing, isolating and relieving air volume and pressure across the duct network.
- [Volume Control Duct Damper (HHE/VCD)](https://hayanhvac.com/products/volume-control-damper): Volume control dampers (AirVent HHE/VCD): multi-blade GI/SS304 dampers with gear handles or motorized actuators for duct balancing in supply and return mains. Surat-manufactured.
- [Aerofoil Volume Control Damper (HHE/AF-VCD)](https://hayanhvac.com/products/aerofoil-volume-control-damper): Aerofoil volume control dampers (HHE/AF-VCD / AF-VCD-MO): shaped blades throttle high-airflow mains smoothly, with less noise and turbulence.
- [Round - Volume Control Damper (HHE/R-VCD)](https://hayanhvac.com/products/round-volume-control-damper): Round volume control dampers (HHE/R-VCD / R-VCD-MO): single-blade balancing dampers for round ducts, spigots and branch take-offs.
- [Pressure Relief Damper (HHE/PRD)](https://hayanhvac.com/products/pressure-relief-damper): Pressure relief dampers (AirVent HHE/PRD): weight-balanced blades that open automatically at the set differential and reseat on fall, cleanroom and stairwell pressurization control.
- [Non - Return Damper (HHE/NRD)](https://hayanhvac.com/products/non-return-damper): Non-return / backdraft dampers (AirVent HHE/GGL): gravity counterbalanced aluminium blades in GI frames that shut when the fan stops, passive backflow prevention at fan discharge.
- [Opposed Blade Collar Damper (HHE/OBD)](https://hayanhvac.com/products/opposed-blade-collar-damper): Opposed blade collar dampers (HHE/OBD): balancing built into the duct collar, linear throttling adjusted through the collar face.
- [Butterfly Collar Damper (HHE/BFD)](https://hayanhvac.com/products/butterfly-damper): Industrial butterfly dampers (HHE/BFD): reinforced discs on heavy shafts for large round ducts and stacks, 300 mm to 2 m+. MS/SS304/SS316 construction for hot, fast and abrasive air.
- [Fire Damper (HHE/FD-FL)](https://hayanhvac.com/products/fire-damper): Fire dampers (HHE/FD-FL / FD-FL-MO): 120°C thermal fuse or spring-return actuator, heavy-duty GI/SS construction for fire-rated wall and slab penetrations.
- [Fire and Smoke Damper (HHE/FSD)](https://hayanhvac.com/products/fire-smoke-damper): Fire and smoke dampers (AirVent HHE/FSD): fire-rated blades with smoke-leakage performance, 120°C thermal fuse or smoke-detector actuation, heavy-duty GI/SS construction for life-safety ductwork.
## Other Products

- [Other Products category page](https://hayanhvac.com/products/other-products): The fabricated pieces that complete a system: fresh air and gravity louvers, transfer grilles, return air risers, plenum boxes and flexible ducts.
- [Fresh Air Louver (HHE/FAL)](https://hayanhvac.com/products/weather-louver): Weather louvers (AirVent HHE/FAL) with drainable blades, insect, bird and sand screens and acoustic options for fresh air intakes, plant rooms and facades. Monsoon-rated, made in Surat.
- [Z Type Blade Louver (HHE/ZTL)](https://hayanhvac.com/products/z-type-blade-louver): Z type blade louvers (HHE/ZTL): chevron-profile blades with enhanced wind-driven rain capture for exposed intakes and monsoon-facing facades.
- [Door Transfer Louver (HHE/DTL)](https://hayanhvac.com/products/transfer-grille): Transfer grilles (HHE/DTL) in slim fixed-bar construction with sight-proof cores: door and partition transfer for toilet make-up air, corridor equalization and zone pressure relief.
- [GI Gravity Louver (HHE/GGL)](https://hayanhvac.com/products/gi-gravity-louver): GI gravity louvers (HHE/GGL): counterweighted blades that open on airflow and close by their own weight, passive rain and back-draft protection.
- [Return Air Riser (HHE/RAR)](https://hayanhvac.com/products/return-air-riser): Return air risers (HHE/RAR / RAR-I): fabricated GI vertical duct sections, flanged and shaft-ready, with insulated options for multi-floor return paths.
- [GI Plenum Box (HHE/GPB)](https://hayanhvac.com/products/plenum-box): Factory-built plenum boxes (HHE/GPB) for ceiling diffusers: GI construction to site depth, side or top spigots, optional balancing dampers and acoustic lining. Made to each diffuser model.
- [Flexible Duct (HHE/FXD)](https://hayanhvac.com/products/flexible-duct): Insulated flexible ducts (HHE/FXD): wire-helix polyester core with 25 mm insulation and vapour barrier, 100–500 mm diameters. The bend-where-you-need-it final connection to terminals.

## House of brands

- [Star brand page](https://hayanhvac.com/brands/star): Star is the FCU specialist of the house.
- [Diamond brand page](https://hayanhvac.com/brands/diamond): Diamond is the washable nylon mesh pre-filter line: the sacrificial first stage that knocks down large dust, lint and debris before it reaches coils and finer media.
- [Advance brand page](https://hayanhvac.com/brands/advance): Advance flat panel box filters are the bulk coarse stage for FCUs, small AHUs and general ventilation, in G2 to G3 grades.
- [Eakon brand page](https://hayanhvac.com/brands/eakon): Eakon indoor dust filters are the room-side dust stage for indoor air conditioning units, capturing at 10 and 20 micron.
- [Swas brand page](https://hayanhvac.com/brands/swas): Swas is the FCU and return-air pre-filter line.
- [Accurate brand page](https://hayanhvac.com/brands/accurate): Accurate is the AHU pre-filter line: panel-type filters in 10/20 micron and rod-type filters in matched 10/10 micron, the workhorse first stage of a commercial AHU that loads evenly across both faces..
- [DuraMet brand page](https://hayanhvac.com/brands/duramet): DuraMet is the metal mesh line: expanded aluminium and stainless steel wire mesh pre-filters that degrease, wash and go straight back into service.
- [Active brand page](https://hayanhvac.com/brands/active): Active is the activated carbon line: flat panel and deep-bed granular carbon filters that adsorb odours, gases and VOCs, for airport terminals, laboratories and kitchen exhaust scrubbing.
- [Kaizen brand page](https://hayanhvac.com/brands/kaizen): Kaizen Microvee is the AHU fine-filter line: rigid, deep-pleat packs of high-density synthetic or glass fibre media from M5 through F8.
- [Pocketto brand page](https://hayanhvac.com/brands/pocketto): Pocketto is the pocket bag line: G4 pre bags through F9 super-fine bags, with kilograms of dust holding for high-airflow AHUs.
- [HEPA Deep Pleat brand page](https://hayanhvac.com/brands/hepa-deep-pleat): The deep-pleat family carries the absolute stages: semi-HEPA at F9, EPA at H10 to H12 and HEPA at H13/H14 in deep-pleat packs with aluminium separators, plus high-flow and 250°C high-temperature builds.
- [HEPA Mini Pleat brand page](https://hayanhvac.com/brands/hepa-mini-pleat): The mini-pleat family packs more media into every frame: thermally sealed, separator-less EPA and HEPA packs with low pressure drop in slim anodized frames, and a knife-edge gel-seal build for zero-bypass terminal duty..
- [AirVent brand page](https://hayanhvac.com/brands/airvent): AirVent is the air distribution house: every grille, diffuser, jet nozzle, disk valve, damper, louver and fabricated duct piece in the catalogue carries its mark.

## Complete digest

- [llms-full.txt](https://hayanhvac.com/llms-full.txt): the full catalogue in one markdown file, company facts, every product's description, specifications, applications and FAQs, plus technical articles

## Pages

- [Product catalogue](https://hayanhvac.com/products): all seventy-three products across the four categories
- [House of brands](https://hayanhvac.com/brands): the brand families behind the catalogue, four groups from FCU nylon mesh pre filters to AirVent air distribution, each family with its own page
- [About Hayan HVACR](https://hayanhvac.com/about): company and manufacturing craft
- [Contact](https://hayanhvac.com/contact): quote requests, phone, WhatsApp, email
- [Technical articles](https://hayanhvac.com/blog): HVAC engineering notes
- [HVAC glossary](https://hayanhvac.com/glossary): thirty air-engineering terms from filtration, distribution and control, defined in two sentences each

## Articles

- [Fire damper codes in India: where an FD is mandatory.](https://hayanhvac.com/blog/fire-damper-codes-india): The code is not ambiguous about fire dampers: wherever a duct crosses a fire separation, the penetration is protected or the rating is lost. Where they land, and what your inspector will ask for.
- [How to size a jet nozzle: throw, height and the farthest seat.](https://hayanhvac.com/blog/jet-nozzle-throw-sizing): The nozzle is the terminal of last resort for tall, long spaces, which is exactly why sizing it wrong is so visible. A working method, without the catalogue lore.
- [G2 to F9: air filter grades explained without the jargon.](https://hayanhvac.com/blog/air-filter-grades): Filter grades are the most quietly expensive decision in an HVAC system. Pick wrong and you either choke the fan or replace media every month. Here is what the grades actually mean.
- [Grille or diffuser? Choosing the right terminal device.](https://hayanhvac.com/blog/grille-or-diffuser): They both sit at the end of a duct and both blow air into a room, and yet picking wrong shows up within a week of commissioning. Here is how the choice actually works.
- [Types of aluminium air grilles, and where each one belongs.](https://hayanhvac.com/blog/types-of-air-grilles): Linear bar, fixed pattern, double deflection, floor, sill — the same word covers five different products. A field guide to air grilles (yes, people spell it air grill) and the room each one was born for.
- [What throw distance really means, and how we test it.](https://hayanhvac.com/blog/throw-distance): Throw is the most quoted and least understood number in air distribution. A supplier's throw figure and your experience of it can differ by meters, and the reasons are physical.
- [Weather louvers: choosing blades for a monsoon climate.](https://hayanhvac.com/blog/weather-louver-guide): A louver is the building's nostril, and on the west coast of India it takes a beating for four months a year. Drainable blades, screens and free area, explained for plant rooms and facades.
- [Dampers explained: VD, FD and MFD in plain language.](https://hayanhvac.com/blog/dampers-explained): Three letters separate a balanced system from a fire hazard. Dampers are the least glamorous product we make and the one we are most careful with.

## Optional

- [XML sitemap](https://hayanhvac.com/sitemap.xml): every indexable page