Unfortunately I have no ducting between the filter and the furnace cold air
return. The filter box is mounted immediately to the furnace's side. Would the
probe for that thing work if it were just placed inside the squirrel-cage area
of the blower?
Yes, when HVAC contractors installed my new unit,they tapped into the
case to measure pressure drop, then sealed the hole. I see no reason
why you can't do the same thing.
Make sure that the fan can't draw air around your probe. Seal the
The thing about the 5" filters is that they start at roughly the same
back pressure as a good 3M filter, but load up VERY slowly because of
the VAST increase in surface area.
The 3M will be excessively loading the fan in under 90 days, in many
cases, under 30 days, costs $15-$20 and has to be replaced 4 or more
times a year.
The 5"filter won't get to the same back pressure as the 3M for 9 months
to 12 months or longer.
Spend $45 once a year and trap more dirt and let your furnace run more
efficiently, or spend $80 a year...
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