Damper

Baffle plate in a ridge ventilator that can be opened or closed using the cable catch assembly.

Dead Load

The self-weight of the pre-engineered building structure including all its components such as frames, floors, secondary members, sheeting, bolts, etc.

Design Codes

Regulations developed by recognized agencies establishing design loads, procedures, and construction details for structures. Examples are: MBMA, AISC, AISI, AWS, etc.

Diagonal Bracing

See Brace Rods/Cables.

Door Guide

An angle, channel, or proprietary product used to restrain a door leaf or curtain during its opening and closing.

Door Stopper

A clip bolted to the vertical door member to prevent opening beyond the door limit.

Double Channel

Double or back-to-back "C" sections stitch-bolted together.

Double Faced Tape

Used as an aid to fix fiberglass insulation.

Double Sliding Door

Sliding door with two door leaves.

Downspout

Cold-formed sheet metal section used to carry water from the gutter of a building to the ground or storm drainage system.

Downspout Elbow/Shoe

Cold-formed sheet metal section, matching the downspout profile, attached to the lower end of a downspout and curved in such a way as to direct water away from a wall.

Downspout Straps

Metal straps used to fix the downspouts to the sidewalls.