Photo 1 of PATIKIL 17" x 17" Square Ceiling Diffuser, Aluminum Square Vent Cover HVAC Ceiling Diffuser for HVAC System Horizontal Flow Duct Industrial Home Office,White,20" x 20" Ducting Opening Size

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Photo 1 of PATIKIL 17" x 17" Square Ceiling Diffuser, Aluminum Square Vent Cover HVAC Ceiling Diffuser for HVAC System Horizontal Flow Duct Industrial Home Office,White,20" x 20" Ducting Opening SizePhoto 2 of PATIKIL 17" x 17" Square Ceiling Diffuser, Aluminum Square Vent Cover HVAC Ceiling Diffuser for HVAC System Horizontal Flow Duct Industrial Home Office,White,20" x 20" Ducting Opening Size