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www.desatech.com

116208-01G

11

NOTICE: If your installation does 

not meet the minimum clearances 

shown, you must do one of the 

following:

•  raise the mantel to an accept

-

able height

•  remove the mantel

BUILT-IN FIREBOX INSTALLATION

Built-in  installation  of  this  firebox  involves 
installing firebox into a framed-in enclosure. 
This makes the front of firebox flush with wall. 
Optional brass trim accessories are available 

(see 

Accessories, 

page  15).  Brass  trim  will 

extend  past  sides  of  firebox  approximately 
1/2". This will cover rough edges of wall open

-

ing. If installing a mantel above firebox, you 
must  follow  clearances  shown  in  Figure  6. 
Follow these instructions to install firebox in 

this manner.
1.  Frame in rough opening. Firebox framing 

should  be  constructed  of  2  x  4  lumber 

or heavier. Use dimensions in table and 

rough opening layout in Figure 7a. Adjust 

framing  so  that  firebox  is  flush  with  fin

-

ished wall surface. If installing in a corner, 

use dimensions in Figures 7b, 7c and 7d 
for rough opening.

INSTALLATION

Continued

2.  Install gas piping to firebox location. See 

In-

stalling Gas Line,

 page 12 and 

Connecting 

to Gas Supply 

in log set owner’s manual. 

3.  Carefully set firebox in front of rough open

-

ing with back of firebox inside wall open

-

ing.

 

IMPORTANT: 

If installing a perimeter 

trim  kit,  see  instructions  included  with 
trim accessory. You must install shoulder 
screws from trim kit now.

Figure 6 - Minimum Mantel Clearances 

for Built-In Installation

Supplied 
Firebox
Hood 
Must Be 
Used at 
All Times

Wire-mesh
Screen

Firebox

Noncombustible
Material May
Project Off 
this Surface 
above the 
Firebox Hood

Mantel Shelf

Note

: Any portion of the

mantel shelf must NOT
extend beyond this profile.

12" 16" 20"

1

1

/

2

"

6

3

/

4

"

12"

Note

: All vertical 

measurements are from 
top of fireplace hood 
opening to bottom of 
mantel shelf. 

Wall board or facing
material (above
firebox) may be of
combustible material,
including decorative
mantel ornaments or
other similar projec-
tions off of the facing
material.

Framing
Material

 

 

These minimum clearances replace any other recommended 
clearances supplied with your ANSI Z21.11.2 approved gas logs.

Rough Opening Dimensions for

 

Built-in Installation

Model

Front Width

(Inside to Inside) Height

Depth

(Min.)

32"

34 

7

/

8

"

36 

3

/

4

"

16 

1

/

4

"

36"

41 

1

/

2

"

40 

1

/

2

"

20 

3

/

4

"

42"

48 

5

/

8

"

44 

1

/

2

"

22 

5

/

8

"

Figure 7 - Rough Opening for Installing 

in Wall 

Depth

(Minimum)

Width

(Inside to Inside)

Height 

Figure 7a

37"

45°

41

1

/

2

"

52

11

/

32

"

74"

TOP VIEW

FOR 36"
   MODELS

Figure 7c

30"

45°

34

7

/

8

"

42

7

/

16

"

60"

TOP VIEW

FOR 32"
   MODELS

43" 

45°

48

5

/

8

60

13

/

16

"

 

86" 

TOP VIEW 

FOR 42" 
   MODELS 

Figure 7d

Figure 7b

Summary of Contents for VTFB32

Page 1: ... heater for the minimum fireplace size requirement DO NOT INSTALL THE APPLIANCE IN THIS FIREBOX UNLESS THIS FIREBOX MEETS THE MINIMUM DIMEN SIONS REQUIRED FOR THE INSTALLATION This firebox has been tested and approved under ANSI Z21 91 for use with any ANSI Z21 11 2 approved gas logs INSTALLER Leave this manual with the appliance CONSUMER Retain this manual for future reference UNVENTED VENT FREE ...

Page 2: ...as indicated on the rating plate This appliance is not convertible for use with other gases Aftermarket Completion of sale not for purpose of resale from the manufacturer WARNING This product contains and or generates chemicals known to the state of California to cause cancer or birth defects or other reproduc tive harm IMPORTANT Read this owner s manualcarefullyandcompletely before trying to asse...

Page 3: ...other flammable vapors and liquids 1 Do not use this firebox as a wood burning fireplace Use only decorative unvented room heaters log sets 2 Do not add extra logs or ornaments such as pine cones vermiculite or rock wool Using these added items can cause sooting 3 Use only provided hood or appropriate hood accessory See Accessories on page 15 4 Vent free gas log heaters installed in these fireboxe...

Page 4: ...d to heat These cracks will not affect performance of fireplace or vent free gas logs OUTSIDE AIR KIT ACCESSORY An optional AK4 air kit provides additional out door air to improve burner efficiency and reduce build up of condensation in the living space Follow instructions included with air kit Locating Firebox Planning Plan where you will install the firebox This will save time and money later wh...

Page 5: ... 1415 16 65 16 33 8 16 4 39 16 81 8 41 4 31 2 Built In Side Nailing Flanges 5 8 Figure 1 Firebox Dimensions 32 Models Right Side View Firebox Top View Front View 32 Models Outside Air Kit Location Optional Left Side View with Air Kit Back View Top View 3 815 16 93 4 121 4 191 2 1611 16 19 16 39 16 81 8 213 16 85 8 Built In Side Nailing Flanges Square Gas Line Access Holes ...

Page 6: ...6 36 Models 40 42 Models PRODUCT SPECIFICATIONS Continued Figure 2 Firebox Dimensions 36 and 42 Models 36 and 42 Models Note If only one dimension is shown dimension is the same for both 36 and 42 models Firebox Top View 13 11 16 36 Models 12 3 8 42 Models 7 1 4 36 Models 9 42 Models 2 9 16 101 2 36 Models 121 2 42 Models Outside Air Kit Location Optional Left Side View with Air Kit 1311 16 36 Mod...

Page 7: ...tilation Unusually Tight Construction Air that leaks around doors and windows may provide enough fresh air for combustion and ventilation However in buildings of unusually tight construction you must provide additional fresh air Unusually tight construction is defined as construction where a walls and ceilings exposed to outside atmosphere have a continuous water vapor retarder with a rating of on...

Page 8: ...the outdoors and vents to the outdoors Example Gas water heater _ _________ Btu Hr Vent free heater _ ________ Btu Hr Total _ ________ Btu Hr Air For Combustion and Ventilation Continued 4 Compare the maximum Btu Hr the space can support with the actual amount of Btu Hr used _ _________ Btu Hr maximum the space can support _ _________ Btu Hr actual amount of Btu Hr used Example 63 360 Btu Hr maxim...

Page 9: ...ation for required size of ventilation grills or ducts IMPORTANT Do not provide openings for inlet or outlet air into attic if attic has a thermo stat controlled power vent Heated air entering the attic will activate the power vent Installation Or Remove Door into Adjoining Room Option 3 Ventilation Grills Into Adjoining Room Option 2 Ventilation Grills Into Adjoining Room Option 1 12 12 Outlet Ai...

Page 10: ...ible material must be 4 from side of fireplace cabinet see Figure 5 B Clearances from top of firebox opening to ceiling should not be less than 42 C When firebox is installed on carpeting or other combustible material other than wood flooring firebox should be installed on a metal or wood panel extending full width and depth of enclosure D Clearances from bottom of firebox to floor is 0 INSTALLATI...

Page 11: ...ont of rough open ing with back of firebox inside wall open ing IMPORTANT If installing a perimeter trim kit see instructions included with trim accessory You must install shoulder screws from trim kit now Figure 6 Minimum Mantel Clearances for Built In Installation Supplied Firebox Hood Must Be Used at All Times Wire mesh Screen Firebox Noncombustible Material May Project Off this Surface above t...

Page 12: ... or Wood Screws WARNING Use only non combustible mortar or adhe siveswhenoverlappingthefront facing with noncombustible facing material Installing Firebox USING OPTIONAL ACCESSORY MANTELS WARNING A qualified ser vicepersonmustinstallfirebox Follow all local codes This firebox may be installed using a cabinet mantel accessory against a wall in your home Firebox and cabinet mantel can be installed d...

Page 13: ...R KIT MODEL AK4 OPTIONAL An outside air kit may be installed on left side of fireplace only Vent can be installed through any outside wall a minimum of three feet below fireplace termination cap Handle to operate damper door for outside air inlet will be located inside the left screen pocket of firebox see Figure 11 Pull handle to open or push to close CAUTION Air inlet ducts are not to terminate ...

Page 14: ... web site at www desatech com Replacement Parts Note Use only original replacement parts This will protect your warranty coverage for parts replaced under warranty Parts Under Warranty Contact authorized dealers of this product If they can t supply original replacement part s call DESA Heating LLC at 1 866 672 6040 When calling DESA Heating LLC have ready your name your address model and serial nu...

Page 15: ...de additional air to reduce build up of condensation that occurs in today s tightly constructed homes Mantels 32 Mantels W32TU 32 Wall Mantel Unfinished Traditional W32TO 32 Wall Mantel Oak Stain Traditional C32TU 32 Corner Mantel Unfinished Traditional C32TO 32 Corner Mantel Oak Stain Traditional W32CO 32 Wall Mantel Oak Stain Classic C32CO 32 Corner Mantel Oak Stain Classic W32DO 32 Wall Mantel ...

Page 16: ...8 01G 16 Parts ModelS VFF 32H AKA VFF 32S AKA VFF 36H AKA VFF 36S AKA VFF 42H AKA VFF 42S AKA VTFB32 VTFB32H VTFB36 VTFB36H VTFB42 and VTFB42H 21 23 24 23 24 1 2 3 5 6 4 8 9 10 11 12 13 7 14 15 16 23 25 23 22 20 19 17 18 24a ...

Page 17: ...ctory Retainer 1 13 116532 01 Rear Refractory Retainer 1 14 108413 01 Firebox Top Shield 1 15 Firebox Top 1 16 Starter Pipe Collar 1 17 Insulation Pan 1 18 Fireplace Top Insulation 1 19 Fireplace Top 1 20 20280 Top Spacer 4 21 Fireplace Surround 1 22 108654 01 Gas Conduit Left and Right Assembly 2 23 21171 Gas Knock Out Cover 3 5 24 107128 01 Gas Conduit 2 24a 21379 Gas Conduit 2 21380 Gas Conduit...

Page 18: ...Refractory Herringbone Red 1 122810 01 Left Refractory Herringbone White 1 7 108430 03 Rear Refractory Stacked Red 1 108430 04 Rear Refractory Stacked White 1 122808 02 Rear Refractory Herringbone Red 1 122808 01 Rear Refractory Herringbone White 1 8 108432 03 Right Refractory Stacked Red 1 108432 04 Right Refractory Stacked White 1 122809 02 Right Refractory Herringbone Red 1 122809 01 Right Refr...

Page 19: ...Herringbone Red 1 122813 01 Right Refractory Herringbone White 1 9 116201 01 Bottom Refractory Red 1 116201 04 Bottom Refractory White 1 V F F 3 6 S A K A V F F 3 6 H A K A V T F B 3 6 V T F B 3 6 H KEY NO PART NO DESCRIPTION QTY 6 107812 04 Left Refractory Stacked Red 1 107812 05 Left Refractory Stacked White 1 122818 02 Left Refractory Herringbone Red 1 122818 01 Left Refractory Herringbone Whit...

Page 20: ...pproved by DESA Heating LLC Warranty parts must be obtained through authorized dealers of this prod uct and or DESA Heating LLC who will provide original factory replacement parts Failure to use original factory replacement parts voids this warranty Travel handling transportation diagnostic material labor and incidental costs associated with warranty repairs unless expressly covered by this warran...

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