11/05/2026
Let’s talk about filters today!
If you buy a high “ MERV” rated filter like 10,11,12,13,14+ for a 1” filter slot, chances are you’re starving the system for air. With this filter in the system it shows 0.51 w.c. This is twice as high as it should be. With the filter out we see a huge drop in pressure 0.19w.c.
John what does all that mean? Well think about it like you’re running on a thread mill full speed for 10 minutes. No problem, right? Ok! Now rest, catch your breath, get a drink. Let’s go again same speed and same amount of time but you have to breathe through a straw from McDonald’s the whole time. But you over heat and pass out (short cycle).
Most systems with a 1” filter slot should use a MERV 8 or less and be checked if not changed once every month.
