Hog Slat Inc. Newton Grove, NC USA January 2020 2 Ventilation System Tunnel Door Framing Instructions It is import to make sure the Tunnel Door opening is flat and plumb. A maximum variation of +/- ½” throughout the length of the opening is acceptable. Failure to adhere to this will result in a poorly sealed Tunnel Door. The Tunnel Door should be plumb to within ¼” of vertical. Any variation or “lean” should be toward the center of the building. Again, failure to adhere to this requirement will result in a poorly sealed Tunnel Door and in this case operating problems. Rough Opening Height and Width Rough Opening Height and Width should be 3” less that the Tunnel Door total height and width. For Example: A 4 ft (48”) high by 80 ft (960”) wide Tunnel Door should be framed with a 45” high by 957” wide Rough Opening (See Figure 1). This applies both to new construction and retrofit Tunnel Doors. Perimeter Attachment Boards Perimeter Attachment Boards should be mounted to inside wall of building as outlined below. This Tunnel Door System can be installed to either a steel framed wall or to a wooden framed wall. The lumber used should be compliant with applicable federal and local building codes. The following instructions are minimum requirements and are not meant to supersede these building codes. Figure 1 It is recommended that ACQ Treated Lumber or equivalent be used for framing. The top and bottom stringer should be 2”x 6” and the side stringers should be 2”x 4”. As an option, the side stringers can be 2”x 6” also. The top and bottom stringers should over lap the vertical side stringers (See Figure 1). The stringers should be attached with at least 3 ½” long Deck Grade Wood Screws spaced approximately 6-8 inches apart in a Zig Zag pattern (See Figure 2). The top and bottom stringers should also be Lag Screwed to studs at least every 32” apart (every other stud). The Lag Screw heads should be flush with stringer surface. It is important to Lag Screw the top and bottom stringers as they support the weight of the door (Bottom Stringer) and actuation pulleys, etc (Top Stringer). All joints between horizontal and vertical Stringers should be flush for best sealing of Tunnel Door.
RkJQdWJsaXNoZXIy MTA3MzU=