Clearances To Combustible Materials For The Chimney; Clearances To Combustible Materials For The Plenums; Parallel Installation - PSG CADDY ALTERNA II Installation And Operating Instructions Manual

5.4.2 CLEARANCES TO COMBUSTIBLE MATERIALS FOR THE CHIMNEY

N.B. THE SIZE OF THE AIR RETURN DUCT SHOULD BE AT LEAST EQUAL TO THE SIZE OF THE AIR
RETURN PLENUM OPENING. THE AIR RETURN DUCT MAY BE INSTALLED AT ZERO CLEARANCE TO
COMBUSTIBLE MATERIAL.

5.4.3 CLEARANCES TO COMBUSTIBLE MATERIALS FOR THE PLENUMS

The plenums installed to the furnaces must be constructed of metal in accordance with NFPA 90B, 2-1.3. The
hot air plenum can be passed through the side wall with 2 inches of clearances around the plenum.
5.5

PARALLEL INSTALLATION

The installation of the Caddy Alterna II with another furnace using the same ductwork is not allowed in Canada.
This type of installation is only allowed in the United States. The maximum BTU input of the existing oil,
gas, or electric furnace should be equal or higher than the maximum BTU input of the furnace. It is mandatory to
respect minimum clearances between the ductwork and combustible material as if the wood furnace was
installed as a standalone unit. The ductwork and furnace should be adjusted in order to reach a static pressure
of at least 0.20 IN.WC, but not more than 0.50 IN.WC. A back-flow damper should be installed in the hot air
plenum to prevent the hot air to return into the furnace that is not in operation. Depending on your installation
(see examples below), a back-flow damper may be required in each hot air plenum.
CANADA; The installation in parallel i.e. the Caddy Alterna II furnace combined with another, using the same
system of hot air ducts is not allowed in Canada.
UNITED STATES; The installation in parallel i.e. the Caddy Alterna II furnace combined with another, using the
same hot air duct system is allowed in the United States.
Conditional to;
• The maximum input power of the existing gas, oil or electric furnace should be equal or superior
to that of the wood furnace.
• The clearances required for pellet furnace must be respected.
• The clearances between the hot air ducts and combustible materials must meet the highest
values between the two furnaces.
• The necessary adjustments are made to the furnace or hot air ducts to maintain a static
pressure of between 0.20 and 0.50 IN.W.C.
Hot air plenum minimal height.
19
13" min
(330 mm)