Roberts Gorden CGTH-50 ユーザーズマニュアル

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The CGTH-Series heater must be installed with the 
venting system supplied or with the optional venting 
kit available from Roberts-Gordon. DO NOT connect 
this heater to a separate chimney, and do not com-
mon vent with any other fuel burning appliance.

The CGTH-Series heater employs a balanced flue/air 
venting duct system and must conform to the follow-
ing length requirements:

Maximum Length: 10' (3 m)
Minimum Length: 2' - 6" (.76 m)
Maximum Elbows:Two with natural gas units,

one with propane gas units

The location, size, installation and termination of 
vents, as well as the required safe distances from 
combustibles when penetrating combustible walls, 
must comply with local codes and recommendations 
of the local gas company. United States: Refer to 
National Fuel Gas Code, ANSI Z223.1 - latest revi-
sion (same as NFPA 54). Canada: Refer to CSA 
B149.1 Natural Gas ans Propane Installation Code.

The balanced flue consists of a 3" (8 cm) diameter 
flue which is concentrically positioned inside a 5" 
(12.5 cm) diameter vent pipe (

See Figure 2). The 5" 

(12.5 cm) diameter vent supplies outside air for com-
bustion while the 3" (8 cm) diameter flue carries the 
products of combustion from the heater.

The balanced flue is applicable for both horizontal 
and vertical venting arrangements. Vertical venting 
will require the optional roof venting kit available from 
Roberts-Gordon.

The CGTH-Series heater may be used in certain areas 
of aircraft hangars. Installation in aircraft hangars must 
be in accordance with the following codes: United 
States: Refer to Standard for Aircraft Hangars, ANSI/
NFPA-409 - latest revision. Canada: Refer to Standard 
CSA B149.1 Natural Gas ans Propane Installation 
Code.

• Heaters in aircraft storage or service areas must be 

installed a minimum of 10' (3 m) above the upper 

surface of wings or engine enclosures of the highest 

aircraft which may be housed in the hangar. (This 

should be measured from the bottom of the heater 

to the top of the wing, or engine enclosure, which-

ever is highest from the floor).

• In other sections of aircraft hangars, such as shops 

or offices, heaters must be installed a minimum of 8' 

(2.4 m) above the floor.

• Heaters installed in aircraft hangars shall be located 

so as not to be subject to damage by aircraft, 

cranes, movable scaffolding or other objects.

• When installed over hoists, the required safe dis-

tances from combustibles must be maintained from 

the uppermost point of the combustible materials 

placed on the hoist.

The CGTH-Series heater may be used in public 
garages. Installation in public garages must be in accor-
dance with the following codes: United States: Standard 
for Parking Structures NFPA-88A - latest revision or the 
Code for Motor Fuel Dispensing Facilities and Repair 
Garages, NFPA-30A - latest revision. Canada: Refer to 
CSA B149.1 Natural Gas ans Propane Installation 
Code.

• Heaters must be installed a minimum of 8' (2.4 m) 

above the floor. Required safe distances to combus-

Exterior Wall

Outside Air

Outside Air

Exhaust

Exhaust