How Many Air Filters Do You Need In Your HVAC System?

return air box with filter slot
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Can we see what the remainder of the return duct looks like that hooks up to that base box? air filter is possible in this case Left

Return Air Egg Crate Grilles & Filter · Half Chevron Louvre Grilles WL-RC · Half Linear Slot Diffusers · Perforated Diffusers · Registers · Deflection

return air box with filter slot filter typically fits in a slot on the intake Vertical air handlers have filters located in bases or duct tracks on the return duct

return linear slot diffuser A duct filter box designed for use with inline fans to circulate fresh air and block dust and odors · Built with 1mm thick cold-rolled steel and aluminum duct