Floor and Window Recessed Heaters
Recessed radiation is designed for installation below large glass areas that extend to the floor and do not permit the use of base- board radiation. The heat-emitting unit illustrated in Figure 2-78 is an example of recessed radiation used in a hydronic heating installation.
A typical hot-water recessed radiation heater consists of an enclosure, a finned element, two element glides, two rubber grommets, and a floor grille with or without dampers (see Figure 2-79). The operating principle of this unit is relatively simple. The air entering the unit at the cool-air inlet is separated from the rising heated air by a baffle (see Figure 2-80). The baffle is designed to separate the cool inlet air from the rising heated air and to accelerate the flow of air through the unit for maximum heat output. The baffle is held in position by a guide on each end of the enclosure and a bracket in the center.
Figures 2-81 and 2-82 show openings used to accommodate recessed floor units in a wood floor and in masonry construction. In a wood floor installation where the unit is to be installed parallel to the joists, an opening with the same dimensions as shown should be prepared by installing headers between joists.
