Hearth and Home Technologies HST-48D owner manual Chase Installations, Construct the Chase

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9 Chase Installations

A. Construct the Chase

A chase is a vertical boxlike structure built to enclose the fireplace and/or its vent system. Vertical chimneys that run on the outside of a building must be installed inside a chase.

Construction of the chase may vary with the type of build- ing. These instructions are not substitutes for the require- ments of local building codes. Local building codes MUST be checked.

A chase should be constructed in the manner of all outside walls of the home to prevent cold air drafting problems. The chase should not break the outside build- ing envelope in any manner. All outer walls need to be insulated.

Building codes require false ceiling and ceiling firestops at each floor of the chase or every 10 ft (3.05 m) of clear space to control spread of fire.

Walls, ceiling, base plate and cantilever floor at the first level of the chase should be insulated. See Figure 9.1. Vapor and air infiltration barriers should be installed in the chase as per regional codes for the rest of the home. Ad- ditionally, Hearth & Home Technologies recommends that the inside surfaces be sheet rocked and taped (or the use of an equivalent method) for maximum air tightness.

Round Termination Cap

 

Metal Chase Top

 

 

Ceiling

 

 

Firestop

 

 

False Ceiling

 

 

Attic

 

Tabs

Insulation

 

Shield

 

 

 

 

Ceiling

Insulation in the

 

outside walls

 

Firestop

 

of the chase

 

 

Insulation

Insulation

 

False Ceiling

False Ceiling

 

 

Chimney

 

Figure 9.1

Chase Assembly

 

Gas line holes and other openings should be caulked with high temperature caulk or stuffed with unfaced fiberglass insulation. If the fireplace is being installed on a cement slab, we recommend that in cold climates, a sheet of plywood or other raised platform be placed underneath to prevent conducting cold up into the room.

Three examples of chase applications are shown in Fig- ure 9.2.

1.Chimney offset through exterior wall and enclosed in chase.

2.Chase constructed on roof.

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Figure 9.2 Chase Constructions

WARNING! You must install false ceilings and ceiling

firestops at each floor of the chase or every 10 ft (3.05 m) to control spread of fire.

WARNING! Risk of Fire! DO NOT seal area between fire stop opening and chimney pipe. Restricting air flow around chimney may cause fire.

WARNING! Risk of Fire! You must maintain a minimum 2 in. (51 mm) air space clearance to insulation and other materials surrounding the chimney system.

•Insulation and other materials must be firmly secured to prevent accidental contact with chimney system.

•The chase must be properly blocked to prevent blown insulation or other combustibles from entering and making contact with fireplace or chimney.

•Failure to prevent contact between insulation or other materials and chimney system may cause overheating and fire.

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Heat & Glo • HST-48D US-CAN • 4012-040 • Rev F • 11/08

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Contents Wood Burning Fireplace OperationHot screen/mesh and glass doors will cause burns Fire RiskNumber Listing Label Information/LocationGrate User Guide Table of ContentsInstaller Guide Warranty Hearth & Home Technologies Limited Warranty CONDITIONS, Exclusions & Limitation of LiabilityHeat & Glo HST-48D US-CAN 4012-040 Rev F 11/08 Listing and Code Approvals Appliance CertificationNon-Combustible Materials Combustible MaterialsHot glass will cause burns Operating InstructionsYour Fireplace Seasoned Wood Starting a FireGrate FirescreenGlass Doors Vented Gas Log Sets & Gas Log LightersOptional Components Clear SpaceWood Fuel Hardwood vs SoftwoodDisposal of Ashes Maintainance and ServiceChimney Inspection/Cleaning Glass Cleaning Check Firebox RefractoryInspect Grate Frequency As desiredTroubleshooting Guide Start Fire Problems Possible Cause SolutionGetting Started Typical Fireplace SystemNegative Pressure Design and Installation ConsiderationsDraft Locating Fireplace & Chimney Frequently open doors Central heat outlets or returnsInspect Fireplace and Components Tools and Supplies NeededFireplace System Requirements 1676 mm Hearth Framing & ClearancesSelect Fireplace Location Clearances Clearances to Combustible MaterialsSidewalls/Surrounds Frame the FireplaceInstallation of Fireplace Things to ConsiderPosition the Fireplace Place Protective Metal Hearth StripsFt min. from top of uppermost chimney section to air inlet YESOutside Air Install Outside Air KitHood Wire Ties Chimney Assembly Maintain minimum height of chimney above roofChimney Requirements C,fUsing Offsets/Returns ExampleInstall Chimney Air Kit Assemble Chimney SectionsInstall Ceiling Firestops Installing the Ceiling Firestop Install Attic Insulation Shield 330 mmCut out Hole in Roof Complete InstallationInstall Flashing Chimney Termination Requirements Flat RoofsChase Installations Construct the ChaseInstall Fireplace & Chimney Install Chase TopInstall as per Sections 7 Caulk all seams to prevent leaks Refer to FigureInstall Termination Cap ST1175/ST475 Square Termination CapInstalling a TCT1175 Terra Cotta Cap TCT1175 Terra Cotta CapField Constructed Shrouds ShroudsRadiation Shield Mailbox Style Shroud radiation shield required = 1/k x inches of thickness FinishingHearth Extension High temperature sealant Finishing MaterialFireplace opening 1194 mm Width of fireplace 305 mm Combustible MantelAccessories Gas Log/Lighter ProvisionWood Burning Inserts Gas Code, Ansi Z223.1Fireplace Dimensions Reference MaterialsHeat & Glo HST-48D US-CAN Rev F 11/081676 mm 508 mm 13 mm Chimney Components Catalog #457 mm Inside Diameter39-7/8 711 mm 51 mm25-1/4 14-3/4 375 mm 584 mm Service Parts HST-48DDo not Discard this Manual
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