REZNOR-Gas Unit Heaters - Installation-Operation & Maintenance Instructions - Venting Information - Model UDAP/UDBP

Oct 25, 2026

Installation, operation, and maintenance guidance for REZNOR gas unit heaters focusing on venting requirements for fan-type Model UDAP and blower-type Model UDBP. Provides certified category usage (Category III, with limited Category I conditions for certain UDAP sizes), selection of horizontal or vertical venting, and strict separation between residential and commercial/industrial instructions. Covers vent pipe type selection, diameter and length constraints, sealing, support, condensation handling, vent terminal clearances, and includes addendum sections for double-wall and flex-L vent pipe installation. Includes safety warnings and code compliance requirements.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages49

Reading Time2 h 3 min

AccessFree to download

INSTALLATION-OPERATION &MAINTENANCE INSTRUCTIONS

Venting Requirements

Venting Instructions for V3 Power Vented Unit Heaters

1. Type of Vent Pipe is Determined by

Residential Installation Only (Model UDAP)

Residential Vent Types (Special Horizontal, Standard Horizontal, Vertical)

TABLEs and Figures (Pipe Diameter, Length, Clearances)

ADDENDUM (Double-Wall Type B and Flex-L Vent Pipe)

ECCO HEATING PRODUCTS LTD. \#100-1851 Dayton Street,KelownaBritish Columbia,Canada V1Y 9J7Ph:(250)860-6451Fax:(250)860-3466Toll Free:1-800-399-3226Contact:Grant Weighill,gweighill.kel@eccohtg.com # INSTALLATION-OPERATION &MAINTENANCEINSTRUCTIONS PROJECT:APPLE VALLEY RESIDENCEBenvoulin CourtLOCATION:KELOWNA,B.C. LESLIE ENGINEERING CORP. ENGINEER: CONTRACTOR: VALLEY PLUMBING &HEATING LTD. March 11,2010 DATE: PRODUCT: REZNOR-Gas Unit Heaters -UH-1&UH-2 PRODUCT: REZNOR-Venting Information PRODUCT: REZNOR-Installtion Instructions Table of ContentsPageGENERAL…………………………………1VENTING Requirements ……1RESIDENTIALInstallation,Model UDAP30-125………2-6Type of Pipe………………………2-3Vent Length and Diameter………2-3TABLE1-Special HorizonitalCategory I(Sizes 30-75)………2TABLE2-Standard Vertical&Horizontal (Sizes 30-125)..3Flue Outlet Diameter… …4TABLE3-Sizes 30-125Sealing…………………………4Support……… ……………4Condensation…… … …4Vent Terminal Requirements ……4TABLE4-Horizontal VentClearances… ………………5Horizontal Illustration… …5Vertical Illustration……………6COMMERCIAL/INDUSTRIALInstallation,Sizes 30-400……6-9Type of Pipe…………………6Vent Pipe Diameter andLength… ……… …6-7TABLE5-Vertical andHorizontal RequirementsFlue Outlet Diameter andAttachment……… …………7.TABLE6-Outlet DiameterSealing ………………………………8Support.…………… ………8Condensation……… ……8Vent Terminal Requirements ……8TABLE7-HorizontalVent Clearances…… … …8Horizontal Illustration…… 9Vertical Illustration …………9ADDENDUM…… …10-12Section A-Attaching DoubleWall(Type B)Vent Pipe…..10-11Section B-Installing Flex-L®Category IIVent Pipe……11-12Use this Venting Manual with theHeater Installation ManualHeaterInstallation FormModel UDAP…………Form I-UDAModel UDBP…………Form I-UDB REZNORThomas₈Betts General This manual applies only to venting instructions and must be used with the installationmanual.Both manuals are shipped with the heater.If either manual is missing,contact yourdistributor before beginning installation.The instructions in this manual apply to fan typeModel UDAPand blower type Model UDBP. Verify that the label nearthe vent outlet on theheater matches this label. ## Venting Requirements Model UDAPand UDBPheaters are certified as Category III heaters.Under specifiedcondi- tions,Model UDAPSizes 30-75 may beinstalled as a Category I heater. WARNING:Each heater requires its own individual vent pipe runand vent cap.Manifolding of vent runs can cause recirculation ofcombustion products into the building.Failure to comply couldresult in severe personal injury or death and/or property damage. Venting must be in accordance with local codes and the National Fuel Gas Code Z223.1 orCAN/CSAB149.1 and B149.2,Installation Code for Gas BurningAppliances and Equipment.Local requirements supersede national requirements. These power-vented unit heaters are designed to operate safely and efficiently with either ahorizontal or vertical vent.Comply with the specific requirements and instructions. If this heater is replacing an existing heater,be sure that the vent is sized properly for theheater being installed and that the existing vent is in good condition.A properly sized ventsystem is required for safe operation of the heater.An improperly sized vent system cancause unsafe conditions and/or create condensation.Do not vent into an existing gravityvent or chimney. Installation should be done by a qualified agency in accordance with these instructions.Thequalified service agency installing this system is responsible for the installation. Requirements and instructions vary dependingon whether the installation is residential orcommercial/industrial.Select and follow the ventinginstructions that apply to the installa-tion only.All sizes of Model UDAPand Model UDBPunit heaters are certified forcommer-cial/industrialinstallation.Model UDAPSizes 30,45,60,75,100,and 125 are also certi-fied for residential installation.Unit heaters certified for“residential use”are intended t

FAQs

Which models and venting configurations are covered in this manual?

The manual covers venting instructions for fan type Model UDAP and blower type Model UDBP, including indoor power-vented unit heaters with either horizontal or vertical vent runs.

What is the difference between residential and commercial/industrial venting instructions?

Venting requirements vary by whether the installation is residential or commercial/industrial, and the instructions must not be mixed. Residential guidance applies to specified UDAP sizes and has separate page ranges and vent type rules.

Why is each heater required to have its own individual vent pipe run and vent cap?

Manifolding vent runs can cause recirculation of combustion products into the building, leading to severe personal injury or death and/or property damage.

Oct 25, 2026

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