Additional Details ------------------------------ Product description: Lid Size Medium 26" Across kool kap condensing unit cover, Kool Kap is the world's only permanent, protective air conditioning cover. No other cover can protect your expensive air conditioner while it's operating. Kool Kap's protect your air conditioner all year long and never need to be removed. Kool Kaps are manufactured from a special blend of polymers which are impervious to the sun's UV rays making it virtually indestructable. Kool Kap's are available in three sizes that fit most every brand and model of air conditioner made, new or old. Isn?t it time your air conditioner had a new best friend? Kool Kap Sizing Which size Kool Kap is right for my condenser? A Small Kool Kap will cover a rectangular shaped condenser with a fan opening up to 22 inches in diameter. A Medium Kool Kap will cover a rectangular shaped condenser with a fan opening of 23 inches in diameter up to 26 inches in diameter. A Large Kool Kap will cover a rectangular condenser with a fan opening form 27 inches in diameter to 30 inches in diameter. Kool Kaps WILL NOT FIT on round or cylindrical-shaped condensing units. Installation Instructions NOTE: When mounting Kool Kap to your condensing unit the outdoor temperature must be ABOVE 50F. If the outdoor temperature is below 50ºF you must first warm the surface of the condensing unit where the three hinges will be placed. Use a standard hairdryer; making sure the surface of the condenser is warm/hot to the touch. The adhesive backing on the hinges is very strong, work carefully in positioning each hinge, as you will not get a second chance to reposition the hinge.