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Questions about ENT
1. WHAT IS THE FINISH RATING WHERE ENT IS
INSTALLED?
As previously stated in this manual, when ENT is run
through studs and the wall, construction provides at least
a 15 minute finish rating by using materials shown in the
following chart.
2. WHAT HOLE SIZES DO I NEED FOR ENT RUNS
THROUGH STUDS OR JOISTS?
The absolute minimum size of holes needed are as
follows:
ENT (trade size) Hole (inches)
1
/2 1*
3
/4 1
1
/8
11
1
/2
1
1
/4 1
3
/4
1
1
/2 2
22
1
/2
*This is the only size ENT that can be drilled in the center of
a standard 2  4 inch wood stud and maintain 1
1
/4 inch
from each edge.
3. HOW DO I INSTALL
3
/4 INCH ENT AND OTHER
LARGER SIZES OF ENT IN STUDS OR JOISTS?
For
3
/4 inch ENT, start your 1
1
/8 inch hole 1
1
/4 inch from
the edge and cover the other side of the stud with a
1
/16
inch thick steel plate moved over the hole where it is less
than 1
1
/4 inch from the other end of the stud (see Section
300.4(A)(1), Section 10 of this manual.)
FINISH RATINGS OF WALLS
Finish
Rating
Material Min.
Fireboard,
1
/2" thick with
1
/2" 112,112
Gypsum sand plaster 15
Gypsum wallboard,
1
/2" thick 15
Gypsum wallboard,
5
/8" thick 20
Laminated wallboard,
3
/8",
1
/2" and
5
/8
" thick 28-60
From National Bureau of Standards, BMS-92
Table 3-1