Universal Heavy Duty Foldable Insulated Wall Sleeve for Standard PTAC 42" x 16" MERV stands for Minimum Efficiency

MERV stands for Minimum Efficiency Reporting Value

The smart electronic control board located in the air handling units controls the heater most efficiently based on your thermostat settings

and log tongs handcrafted by Amish farmers in a traditional blacksmith forge for true quality

electric or oil furnaces

Suitable for applications with refrigerants R-410A

Universal Heavy Duty Foldable Insulated Wall Sleeve for Standard PTAC 42" x 16" MERV stands for Minimum EfficiencyUniversal Foldable Wall Sleeve for Standard Size PTAC, 42" x 16" Packaged Terminal Air Conditioners and Packaged Terminal Air Conditoner Heat Pumps (PTAC and PTHP) are all in one heating and cooling units that are easy to install and use, but they do require a wall sleeve and a grille. The wall sleeve is used for PTAC thru the wall air conditioners, also sometimes called hotel type air conditioners or wall air conditioners. Industry standard wall