4″ AmeriVent Wall Thimble 4BEWT Type B Gas Vent
The wall thimble adjusts for various wall thicknesses from4″ to 6″. The air space between the inner and outer pipes provides insulation to keep the flue gases on the rise.
The wall thimble adjusts for various wall thicknesses from4″ to 6″. The air space between the inner and outer pipes provides insulation to keep the flue gases on the rise.