Desa (V)gM50, (V)gM42 Venting Installation, Optional Outside air Kit Model ak4/ak4f, Chimney Pipe

Venting Installation

Optional Outside air Kit (Model ak4/ak4f)

The installation of an outside air kit should be per- formed during the rough framing of the fireplace due to the nature of it's location. Outside combus- tion air is accessed through a vented crawl space (AK4F) or through a sidewall (AK4).

CAUTION: Combustion air inlet ducts shall not terminate in attic space.

Secure to Collars with Metal Tape, Screws or Straps (Min. of 1/4" x 20" in size)

Air Inlet
Location
Must Allow
For Bushes
or Snow
	Air Inlet
	Eyebrow
Vented Crawl Space	Vent Hood
	Required for
(Check Local Codes
	Wall Installation
Before Installing in a
Vented Crawl Space)
Figure 5 - Outside Air Kit

Chimney Pipe

The DESA chimney system consists of 12", 18", 24", 36"' and 48" snap-lock, double-wall pipe segments, planned for maximum adaptability to individual site requirements. Actual lengths gained after fitting overlaps must be taken into consideration (lineal gain) and are given in the lineal gain chart (see Figure 6). Lineal Gain is the actual measurable length of a part after two or more parts are connected. For Canada, use chimney parts designated "HT".

WARNING: The opening in the collar around the chimney at the top of the fireplace must not be obstructed.Neveruseblowninsula- tion to fill the chimney enclosure.

LINEAL GAIN

PART NO.	DESCRIPTION	GAIN (IN)
Georgian	Fireplace	66 1/2"
12-12DM	Pipe Section	10 5/8"
12-12HT
18-12DM	Pipe Section	16 5/8"
18-12HT
24-12DM	Pipe Section	23 5/8"
24-12HT
36-12DM	Pipe Section	34 5/8"
36-12HT
48-12DM	Pipe Section	46 5/8"
48-12HT
RLT-12D	Round Termination	7 3/4"*
RLT-12HT
STL-12D	Square Chase-Top	7" to 15"*
	with Slip Section

*The lineal gain for the terminations is mea- sured to the flue gas outlet height.

15" Galvanized

Outer Pipe

12 3/8"	Hemmed
Stainless	End
Inner Pipe

Figure 6 - Lineal Gain

Assembly and installation of double wall chimney system

Each double wall chimney section consists of a galvanized outer pipe, a stainless steel inner flue pipe and a wire spacer. The pipe sections must be as- sembled independently as the chimney is installed. When connecting chimney directly to the fireplace, the inner flue pipe section must be installed first with the lanced side up. The outer pipe section can then be installed over the flue pipe section with the hemmed end up. Press down on each pipe section until the lances securely engage the hem on the fire- place starter. The wire will assure the proper spacing between the inner and outer pipe sections.

Continue to assemble chimney sections as outlined above, making sure that both the inner and outer pipe sections are locked together. When install- ing double wall snap-lock chimney together, it is important to assure the joint between the chimney sections is locked. Check by pulling chimney upward after locking. The chimney will not come apart if properly locked. It is not necessary to add screws to keep the chimney together (exception, see Figure 9, page 10).

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