What we have learned fabricating air distribution and filtration, written down for consultants, contractors and the curious.
21 October 20264 min read
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.
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15 October 20265 min read
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.
8 October 20265 min read
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.
18 September 20264 min read
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.
5 September 20265 min read
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.
2 August 20265 min read
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.
12 July 20264 min read
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.
21 June 20264 min read
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.