This is a brand new top-quality 4" Inline Duct Muffler for 4" high velocity fans/blowers. With durable 24 Gauge galvanized sheet construction with 4 Inches High quality Insulation and cover it with galvanized perforated sheet to reduce noise effectively and prevent your health from being hurt by noise. The special designed crate is good for superior sound absorption.
24x24x2" AC Vent / Return Covers (Case of 10 pcs) During the winter heating season, homeowners with uncovered central air conditioning vents spend more that $200 in unnecessary heating costs that could be saved with A-C DraftShields central AC vent covers. Hot air produced by heating systems in fall/winter lose thermal values of 30% or more through the central air duct system. Heated air rises, and is drawn through unsealed central air conditioning vents into ductwork in the cold attic.
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