Mounting frame  is intend for mounting the flap valve in a ventilation duct or in a hot air distribution system. It is alosw used as a covering of the ventilation ducts air-holes. Easy-Mounting system consists of: placing frame into the air hole in a solid way and screwing the flap valve into it. Flexible ducts can be easily connected to the frame. 

CAUTION! Mounting frame is added to the flap valve as a standard. Price of the mounting frame is included in the price of a flap valve.