Increasing Efficiency And Hot Air Movement - Lennox Hearth Products Ravelle 30 Installation And Operation Manual

INCREASING EFFICIENCY AND HOT AIR MOVEMENT
A number of different options are available to the homeowner to maximize
the heat output and air movement to different rooms in the house.
Grills: If your Ravelle™ 30 gas fireplace is installed in a cabinet or a chase,
heat can be drawn from these enclosures and circulated into the living
area by cutting one or two openings covered by a register or grill.
Figure 30
Possible Opening and Grill Locations on Cabinet
Figure 31

Opening and Grill into
Adjoining Room
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Whole Home Comfort System:
The Whole Home Comfort System is a very inexpensive and efficient way
to move air into and heat other areas of the house. In the bottom of the
Ravelle 30 gas fireplace are four inch and six inch (152 mm) diameter
knock-out plates. Four inch (102 mm) or six inch (152 mm) diameter
return air ducting may be fastened to the bottom of the fireplace, run into
another room in the house and terminate with a grill. When the fireplace
is burning, with or without the fireplace fan running, air is drawn from
a distant room (lowering the pressure in that room) through the return
air duct into the bottom of the fireplace. The air then passes through the
outer shell and heat exchanger of the fireplace and into the room in which
the fireplace is located. The hot air in the fireplace room moves through
an open doorway or hall into the low pressure room from which the air
was drawn. This system functions well by convection even without the
use of the fireplace fan. A six inch (152 mm) diameter ducting moves
more air than four inch diameter ducting. Ducting in uninsulated areas
of a house (i.e. in the crawl space) should be wrapped in insulation to
ensure maximum heat retention. Check local building codes, some areas
may require firestops when the duct passes from room to room.
Note: Grill can be in the Wall, Ceiling, or Floor.
4" (10 mm) or
Starter Ring
6" (15 mm) Duct
Figure 32
Up to 100 Feet (30.5 M)
Maximum Run