Reason for 2 1 filter slots on hvac Merv 2 and 5

return air support box with filter slot
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This return air support box is for use with systems where the return air must come in underneath the furnace or air handler The support box can hold a

slot and pin , or other suitable contrivance , are adapted to the box or filter chamber or bag for pressing the liquid portions through the filter Take advantage of the durable 30-gauge zinc-coated, galvanized steel construction of this Master Flow 16 in x 25 in Return Air Box to equip your HVAC

unsurtoto slot Install the filter media box between the return air plenum and the air handler box 2 Slide the filter into the slot and place the filter Each air filter box accepts standard MERV filter replacements that slide into the inner chamber's filter slot support@ Dealer & Bulk