Related Sites

Noise Control
Anechoic Chambers
Sound Level Meters
Audiology Rooms
Noise At Work
School Acoustics

• If door is hard to operate in both directions
  • Door is out of plumb. Loosen the two bolts on the cam at the top of the door, shim the door out until plumb using 1/16" plastic shims supplied with the door and re-tighten the bolts.
• If door is hard to operate in one direction
  • Cam or bottom bearing is not square or level and is binding on shaft. Loosen cam and bottom bearing bolts. Allow door to reseat and tighten bolts.
  • Cam holes not level. Lift door off cam using spacer block. Loosen cam bolts, lift cam on side of door that would not close and tighten bolts.
• If door does not fully close
  • Bottom air seal is dragging. Hold air seal using needle nose pliers and trim and trim with razor knife to floor contour.
• If doors do not meet in center or single door does not close in one direction only
  • Confirm absence of wind or negative air pressure at opening. If not, jambs are not parallel. Use half-shims behind one side of cam to align each door.

Next Step 4