studies have shown that a simple inch space in your hvac system is equal to a 20 inch hole in the side of your house. features speedi-boot is assembled in the usa w/domestic and imported parts simple telescoping hanger arms save installation time and labor cost, and that can saves you 20 minutes or more per boot installation speedi-bootsinnovative foam gasket seals air tight at installation that reduces energy loss and saves money sp The air tight gasket eliminates air leakage saving you money & energy. Hangers SBS-4127 SB 4in X 12in X 7in speediboot prevents dust & debris contamination in hvac systems during construction, which improves indoor air quality & saves energy.the rigid galvanized frame has predrilled holes for easy grille/register installations; no more sagging registers.
AF MERV 11, comparable with MPR 1200 Allergen or Micro Particle MPR800 (clean living and dust & pollen).., 6PK Made in the USA. These filters have a MERV 11 rating: Removes dust, pollen, mold, dust mites, pet dander, smoke, smog, and lint.