Technical Installation Instructions


There is no standard or definitive guide to the installation of access covers and frames. These recommendations are designed to assist in the installation of ERMATIC covers in general situations that present no particular technical difficulties.


All frames and beam wallboxes must be adequately, solidly and continuously supported to a degree sufficient for the designed load conditions in each particular case. ERMATIC covers and frames are made from machined elements, assembled to strict tolerances.


We're here to help you:

PDF Brochure
ERMATIC and Modular Solutions (35mb)

EJ Website
Complete line of products & specifications.

Contact Us
Experts at EJ for installation advice.


1. Rebate
2. Installation
3. Grouting
4. Filling
5. Finishing

Operation of Ermatic covers

Opening direction
  • Covers can only be opened in one direction, as indicated by an arrow as shown below.
  • Remove the plastic keyhole caps.
  • Cover handling
  • To handle the covers, use a pair of EM keys with the blocking and jacking bolts.
  • Opening
  • Note: the covers only open in one direction; as shown by the arrow on figure a.
  • Clean the keyways with a screw driver.
  • Completely insertthe EM keys.
  • Tighten by hand the blocking bolt (A) to lock the key in position. Do not over tighten the blocking bolt, as this will damage the key.
  • Tighten the jacking bolt (B) to put tension on the cover/frame joint.
  • Apply downward pressure to the end of the EM keys to assist leverage.
  • Lift the one edge of the cover from the frame.
  • Pull the cover from the frame along the greased machined seatings.
  • Maintenance
  • Before delivery, all the machined faces of the 1/2/3 part cover and frame are greased (duct covers and beamed multiples are greased by the contractor on site). Covers are partially painted with water soluble black paint.
  • In service, after each cover opening and when performance and environmental requirement demand, it is necessary to clean and apply an appropriate grease (see section on grease) to the machined faces of the cover and frame.
  • Covers with locking bolts
  • Note the position of the covers in the frame, these are not interchangeable.
  • Unscrew the locking bolts with:
  • For CHC: a six sided spanner. (size 10/12 or 14)
  • For OTC: a special OTC spanner.
  • Note: the OTC bolt is a left hand thread.
  • Interchangeability of covers
  • 1/2/3 part covers and frames not locked, class < D400: the covers are interchangeable within the original frames.
  • 1/2/3 part covers and frames locked, class < D400 Duct covers (< 3 covers long), beamed multiples covers: the covers are not interchangeable. They have to be positioned precisely, in accordance with the marking system visibly stamped into each cover and frame at the factory.
  • Closing
    Before closing:
  • Clean and grease the machined faces of the cover and frame.
  • Unscrew the jacking bolt on the EM key so that it is not on the way during the operation. (B)
  • Position the covers in place, respecting (if appropriate) the marking system visibly stamped into each cover and frame.
  • Replace the plastic keyhole caps.
  • Characteristics of graphite grease
  • Resistance to loading and shock.
  • Good adherence.
  • Insoluble in water.
  • Good resistance to extremes of temperature.
  • Elf Cardrexa GEP 2 is recommended