RE: How do you measure system airflow?
So much of what we do requires either measuring or approximating airflow measurement on the entire system (over the evaporator coil) what method or methods do you use?
If you absolutely had to get a system air measurement within 5% of reality on every call what method would you use?
I started off using the static pressure charts, using generic fan curve charts from NCI when factory data wasn’t available. I got a small vane anemometer measuring feet per minute directly at the registers, with an equation for size and max flow. After a while I made square aluminum funnel (homemade hood) to use with the vane anemometer. Then stepped up to a TSI flow hood, finally got the true-flow grid that takes the filters place and measures air flow a little simpler. Every once in a while I’ll pull out one of the older setups, and appreciate the more expensive tools, reminding me of how much work it used to take.