No. 1018181 Air Filter 18x18x1

Metal-Faced Fiberglass Disposable Filter, 12 per box, $5.87 each

Air Filter
Fiberglass With Tackifier
MERV 5
Nominal Height 18 In
Nominal Width 18 In
Nominal Depth 1 In
Actual Height 17 3/4 In
Actual Width 17 3/4 In
Actual Depth 3/4 In
Frame Type Heavy Duty Chipboard
Air Flow 300 FPM
Initial Resistance 0.04 In WC
Final Resistance 0.5 In WC
Max Air Flow 777 FPM
Max Temp 150 F
UL Class 2 R13458