Gray Carpet Tile, Level Loop, 19 11/16 inL X19 11/16 inW X 7/64 in H, 20 PK/ SPECIAL FEATURES: EXHAUST FAN, SHUTTER MOUNTED, PROPELLER DIA 20 IN, CFM @ 0.000-IN SP 295, @ 0.125-IN SP 2450, 115 VOLTS, 60 HZ, 1 PHASE, FULL LOAD AMPS 4.3, 1/4 HP, SONES @ 0.000-IN. SP @ 5 FT., MAX AMBIENT TEMP 104 DEG F, MOTOR TYPE SHADED POLE, BEARING TYPE SLEEVE, HEIGHT 23 1/8 IN, WIDTH 23 1/8 IN, MAX DEPTH 15 1/8 IN, SQ OPENING REQUIRED 21 IN, PROPELLER MATERIAL STAMPED ALUMINUM, GUARD MATERIAL STEEL WIRE, NUMBER OF BLADES 3, INCLUDES AUTOMATIC SHUTTER