System tested with a pressure differential of 2.5 Pa between the exposed and the unexposed surfaces with the higher pressure on the exposed side.

1. Wall Assembly — The 1 hr fire-rated gypsum board/stud wall assembly shall be constructed of the materials and in the manner specified in the individual U300 Series Wall and Partition Designs in the UL Fire Resistance Directory and shall include the following construction features:

A. Studs — Wall framing to consist of nom 2 by 6 in. (51 by 152 mm) (or larger) wood studs or doubled or staggered nom 2 by 4 in. (41 by 102 mm) (or larger) wood studs spaced in accordance with the individual U300 Series Wall and Partition Designs.

B. Insulation* — R13 (or higher) glass fiber or mineral fiber batt insulation friction fitted into stud cavity.

C. Gypsum Board* — One layer of nom 5/8 in. (16 mm) thick gypsum board, as specified in the individual Wall and Partition Design. Max diam of opening is 5 in. (127 mm).

2. Piping System — One nom 3 in. (76 mm) diam (or smaller) Schedule 40 solid core or cellular core PVC pipe with PVC tee clean-out for use in closed (process or supply) or vented (drain, waste or vent) piping systems, installed within stud cavity. PVC clean-out to be located behind opening in gypsum board.

3. Fill, Void or Cavity Material* - Putty — A Min 1/4 in. (6 mm) thick by 3/4 in. (19 mm) wide strip of fill material applied completely around perimeter of opening under the cover plate

RECTORSEAL Metacaulk Fire Rated Putty, Biostop Fire Rated Putty.

3A. Fill, Void or Cavity Material*- Putty Pads — As an alternate to Item 3, nom 1/8 in. (3.2 mm) thick putty pads to be cut to size, pad liner removed, and the thickness doubled to achieve a min 1/4 in. (6 mm). The material shall be applied under the cover plate around the perimeter of the opening to a min 1/4 in. (6 mm) thickness by 3/4 in. (19 mm) width.

RECTORSEAL — Metacaulk Fire Rated Putty Pads, Biostop Fire Rated Putty Pads.

4. Cover Plate — Min 6-1/2 in. (165 mm) diam 24 gauge (or heavier) stainless steel cover plate secured to PVC clean-out with stainless steel screw through center of plate. Cover plate to be tightened squarely to wall and shall overlap surface of gypsum board a min of 3/4 in. (19 mm) around entire perimeter of opening.