Lennox ML196UH030XE36B, Unit Information

Page 22

II-PLACEMENT AND INSTALLATION

Pipe & Fittings Specifications

All pipe, fittings, primer and solvent cement must conform 

with American National Standard Institute and the Ameri

-

can Society for Testing and Materials (ANSI/ASTM) stan

-

dards. The  solvent  shall  be  free  flowing  and  contain  no 

lumps, undissolved particles or any foreign matter that ad

-

versely affects the joint strength or chemical resistance of 

the cement. The cement shall show no gelation, stratifica

-

tion, or separation that cannot be removed by stirring. Re

-

fer to TABLE 10 for approved piping and fitting materials.

TABLE 10 

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 PVC (Pipe)

D1785

Schedule 40 PVC (Cellular Core Pipe)*

F891

Schedule 40 PVC (Fittings)

D2466

Schedule 40 CPVC (Pipe)

F441

Schedule 40 CPVC (Fittings)

F438

SDR-21 PVC or SDR-26 PVC (Pipe)

D2241

SDR-21 CPVC or SDR-26 CPVC (Pipe)

F442

Schedule 40 ABS Cellular Core DWV 

(Pipe)*

F628

Schedule 40 ABS (Pipe)

D1527

Schedule 40 ABS (Fittings)

D2468

ABS-DWV (Drain Waste & Vent) (Pipe & 

Fittings)

D2661

PVC-DWV (Drain Waste & Vent) Pipe & 

Fittings)

D2665

PRIMER & SOLVENT CEMENT

ASTM 

SPECIFICATION

PVC & CPVC Primer

F656

PVC Solvent Cement

D2564

CPVC Solvent Cement

F493

ABS Solvent Cement

D2235

PVC/CPVC/ABS All Purpose Cement 

For Fittings & Pipe of the same material

D2564, D2235, 

F493 

ABS to PVC or CPVC Transition Solvent
Cement

D3188

CANADA PIPE & FITTING & SOLVENT 

CEMENT

MARKING

PVC & CPVC Pipe and Fittings

ULCS636

PVC & CPVC Solvent Cement
ABS to PVC or CPVC Transition Cement

POLYPROPYLENE VENTING SYSTEM

PolyPro® by Duravent
InnoFlue® by Centrotherm

UL 1738 CERTIFIED GAS VENTING SYSTEM

IPEX System1738 Schedule 40 PVC

Pipes and Fittings

UL1738

IPEX System1738 PVC FGV Cement & 

Primer

* Not approved as of 12-1-2022

 IMPORTANT

Exhaust and intake connections are made of PVC. 

Use PVC primer and solvent cement when using 

PVC vent pipe. When using ABS vent pipe, use 

transitional solvent cement to make connections to 

the PVC fittings in the unit.

 CAUTION

Solvent  cements  for  plastic  pipe  are  flammable 

liquids and should be kept away from all sources of 

ignition. Do not use excessive amounts of solvent 

cement when making joints. Good ventilation 

should be maintained to reduce fire hazard and to 

minimize breathing of solvent vapors. Avoid contact 

of cement with skin and eyes.

Use PVC primer and solvent cement or ABS solvent ce

-

ment meeting ASTM specifications, refer to table 10. As 

an alternate, use all purpose cement, to bond ABS, PVC, 

or CPVC pipe when using fittings and pipe made of the 

same  materials.  Use  transition  solvent  cement  when 

bonding ABS to either
PVC or CPVC.
Low temperature solvent cement is recommended during 

cooler weather. Metal or plastic strapping may be used for 

vent pipe hangers. Uniformly apply a liberal coat of PVC 

primer for PVC or use a clean dry cloth for ABS to clean 

inside  socket  surface  of  fitting  and  male  end  of  pipe  to 

depth of fitting socket.

Canadian Applications Only - 

Pipe, fittings, primer and 

solvent cement used to vent (exhaust) this appliance must 

be certified to ULC S636 and supplied by a single manu

-

facturer as part of an approved vent (exhaust) system. In 

addition, the first three feet of vent pipe from the furnace 

flue collar must be accessible for inspection.