"time to change filter" Meter ?

[billygoat22]

I have the dwyer incline tube manometer, about $30. You could install that and mark the acceptable range with the included arrows- hi and low airflow limits. You would connect to supply and return to get the ESP reading.
Esp will indicate the excact airflow- dirty filter, too many registers closed or dirty coil. After all, its airflow that kills the equipment, whether filter or closed registers.

I came up with a simple unit that would use ESP to cut on the "check" light that many tstats have, about $60 for parts out of grainger catalog. Apparently that's too much and some people would not be able to wire it in, so its in drawer now.

[fl1]

The one you are looking at,works just fine,read the instructions and install it in the correct place.TTt

[albowrx]

Originally posted by hoffa
It costs time

Thats the most ridicoulus(yeah,yeah) statement I`ve heard off. It takes time to wipe your ass off every time you take a shit but we still do it, right. It only takes 3 seconds: take it out, check it, put it back in if its clean. Now go back to being a couch potato.