Check the listing for details. 4pack 36" x 4" Magnetic Fireplace Draft Stopper Cover Chimney Vent Blocker. Color: Black, Condition: New. Listed at 47.34 USD. Specification: Color: Black Brown; Material: Rubber Magnetic; Overall Size: 914.4 x 101.6 x 1 mm / 36 x 4 x 0.04 inch (L*W*T); Packing List: 4 x Magnetic Blocker CoversAdvantage: 1. This fireplace vent screen allows you to cut down energy consumption by reducing the heat lost, thus allowing you to save utility bills. 2. Improved insulation, stopping dust and pollen from entering the room when the fireplace stops working and avoiding unnecessary cleaning. 3. Wide range of applications, the magnetic cover fits wood burning fireplace, gas fireplace, vents and grilles of HVAC system, RV etc.Instruction: Easy to use, attach the magnetic fireplace vent cover to your fireplace vents and adjust its position properly to make sure the vent is fully covered.