Majestic

HHT Wall Firestop DVP-WS

SKU / Model: DVP-WS

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HHT Wall Firestop DVP-WS

Product overview

The DVP-WS is the wall firestop / wall shield for the HHT DVP 5" x 8" direct-vent system. HHT lists it as "pare-feu protecteur mural" (wall firestop shield) in its Approved Vent Components guide. It is a vent component, not a fireplace.

HHT requires a penetrated combustible wall to be framed with a wall shield; a noncombustible wall may instead use a hole 1" larger than the pipe diameter.

Specifications

Manufacturer part number DVP-WS
Component Wall firestop / wall shield
Vent system HHT DVP, 5" inner x 8" outer
Wall thickness (heat shield) 4" to 7-1/4" (102-184 mm)
Thicker walls DVP-HSM-B extended heat shield required over 7-1/4"

Installation and safety notes

Heat shields must overlap at least 1-1/2" (38 mm). Walls under 4" require field trimming of the shields; walls over 7-1/4" require a DVP-HSM-B (4033-215 p.2). Heat shields may not be field-constructed.

On interior walls, a DVP wall shield firestop is required on one side only (2614-980 p.29).

Clearances to combustibles are set by the appliance installation manual; keep insulation and combustibles out of the air space around the vent (4033-215 p.1).

Exact-model manuals and downloads

HHT Approved Vent Components (Composants de l'évacuation approuvés, French edition), 2583-983BFR, 11/23: page 2, Fig. 1 lists DVP-WS.

HHT DVP Venting System Installation Instructions, 4033-215 Rev H, 9/24: page 2 covers wall shields and heat shield wall-thickness rules.

Majestic MARQ36IN-B / MARQ42IN-B Installation Manual, 2614-980 Rev V, 12/25: page 29: wall shield firestop and heat shield rules.

Frequently asked questions — DVP-WS

What wall thickness does the DVP heat shield cover?

4" to 7-1/4" (102-184 mm). Thinner walls require trimming; thicker walls need the DVP-HSM-B extended heat shield.

Do interior walls need a firestop on both sides?

No. The Marquis II manual says a DVP wall shield firestop is required on one side only on interior walls.

Is a wall shield needed on a noncombustible wall?

HHT 4033-215 allows a noncombustible wall to use a hole 1" larger than the pipe diameter instead.

How much must heat shields overlap?

At least 1-1/2" (38 mm).

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