Thermo Products MHA1-75N 用户手册

All installations and services must be performed by qualified service personnel. 
 

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Installation, setup, and operation must be in accordance with the instruction 
provided by the manufacture of the power venter. Thermo Products has provided 
in the following section maximum and minimum vent lengths guidelines that must 
also be followed.    

 

 

 

  

 

Contact Field Controls for instructions for installing the SWGII vent system  
 

IMPORTANT: No warranty will be made on behalf of the appliance manufacturer 
with respect to the sidewall venting system installation or replacement. The 
appliance manufacturer shall not be liable for any special, incidental, indirect, or 
consequential damages. (Some jurisdictions do not allow exclusion or limitation 
of incidental or consequential damages. The above limitations or exclusions may 
not apply to you). 

IMPORTANT: It is the installer’s responsibility to inform and demonstrate to the 
user the correct operation and maintenance of the appliances explained in this 
manual, the user’s information manual, and the sidewall vent manufacturer’s 
manual. 

 

The minimum sidewall vent length is two (2) feet of straight vent pipe with one (1) 
elbow and one (1) adapter or transition to inducer. The maximum vent length and 
permitted number of elbows are shown in the following table. 

SIZE 

OF 

Max. Length of Vent 

 Pipe (in Feet) With 

EQUIVALENT 

LENGTH 

MODEL NUMBER 

OF FURNACE 

VENT 

(In.) 

1 

ELBOW 

2 

ELBOWS

3 

ELBOWS 

OF VENT* 

(Ft) 

MHA1/MDA1-50 3  45  40 

35 

50 

MHA1/MDA1-75 

MHA1/MDA1-100 
MHA1/MDA1-125 

4 45  40  35 

50 

* Each elbow used is considered to be equivalent to 5 feet of straight vent pipe.