I just installed a UV filter for the furnace after reading all the good things here and elsewhere.
I taped up the cold air return and Spaceguard filter with foil tape before installing the UV filter. I saw a couple of leaks I missed when I first fired it up. So I unplugged the filter and taped up the spots I missed. But there are still a couple of indirect leaks (glow) around the humidifier and the hatch for the Spaceguard filter. I plan to tape around the humidifier, but I really can't tape up the door for the Spaceguard filter. Since the furnace is in an enclosed space which keeps out man and beast, how worried should I be about these minor leaks. Do I need to use a regular bulb (non UV) to ferret out any small leaks?
Also I plan to write a few warnings here and there so the HVAC guy doesn't blind himself come the annual cleaning. But I gather this is not a huge deal or they would provide a few labels with this thing?