I recently had my furnace replaced at home. I am used to having to open some kind of door to install the filter.
The HVAC company - who otherwise I've had really good experience with - told me THIS is a common way of doing it: slice the return and just stick the filter into the duct.
Is this legit?
super convenient to change, but a) the filter cannot be inserted completely into the duct, which means it can't be completely efficient, and b) the 'lip' of the duct catches the paper facing of the filter when I remove it.
Go ahead, let me have it.