Imperial 4" Premium Intake Cap with Built-in Pest Guard Screen, White, PA-4W

Imperial 4" Louvered Vent Cap with Metal Screen, White, GG-4W

6-Inch Louvered Dryer Air Vent Cap Cover with Pest Guard Metal Screen, White

DEFLECTO Supurr Louvered Outdoor Dryer Vent Cover, 4 Inches Hood, White (HS4W/18)

New Aroma Trees Dryer Vent Bird Stop - Dryer Vent Grill - Pest Guard - Stops Birds Nesting In Dryer Vents, Customizable 3" - 8" (The Plastic Louvered Vent Cover NOT INCLUDED)

AC Infinity Flexible 4-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 25-Feet Long for Heating Cooling Ventilation and Exhaust

Dundas Jafine FD420ZW Flexible White Vinyl Duct, 4-Inches by 20-Feet, 4" x 20'

VIVOSUN 4 Inch 25 Feet Non-Insulated Flex Air Aluminum Ducting for HVAC Ventilation w/Two 4 Inch Stainless Steel Clamps

klimapartner RKI 4" Professional Backdraft Damper Inline Spring Loaded

VIVOSUN 4 inch Inline Duct Booster Fan 100 CFM, HVAC Exhaust Intake Fan, Low Noise & Extra Long 5.5' Grounded Power Cord

AC Infinity Flexible 6-Inch Aluminum Ducting, Heavy-Duty Four-Layer Protection, 25-Feet Long for Heating Cooling Ventilation and Exhaust