MK Plastics AXTC Centrifugal Inline Fan IO&M - Manual (Page 2)

Roof Curb Attachment
1. Lift the fan onto the roof curb. Make sure the fan securely
sits on the curb and level.
2. It is recommended to secure the fan in place on the curb
with lag bolts spaced at minimum 6” centers.
3. Pre-drill pilot holes through the side of the fan curb cap
and into the curb wood nailer strip.
4. To prevent any possible water penetration, fill the entire
pilot hole or bolt thread with exterior grade, waterproof
silicone caulking.
5. Secure into place through the pilot holes with stainless
steel, lag bolts. Some caulking will be forced out of the
hole to form a better barrier around the fixing.
Vibration Isolators
To prevent vibration and noise from being transferred to
the building, vibration isolators are recommended. Isolators
should be located between the fan system and the support
structure. M.K. Plastics supplies three main types of isolators
for FRP fans:
• Floor Mounted Spring Isolators (floor mounting)
• Floor Mounted Rubber-In-Shear Isolators (floor
mounting)
• Hanging Spring Isolators (ceiling mounting)
Refer to the M.K. Plastics submittal for isolator installation
and adjustment instructions. In applications where seismic
isolators are required, contact M.K. Plastics directly for
further details.
M.K. Plastics Corp. Montréal, Québec www.mkplastics.com Page. 2
Exhaust & Supply Roof Installation
AXTC fans that are roof mounted with curbs should be
securely attached to roof structure such as structural steel,
concrete or wooden decks. Roof structure supports per
structural engineer, in accordance with load requirements
and applicable building codes.
Concrete Roof Deck
Structural Steel Support
Wood Roof Deck
Roof Curb
Structural Steel Support
Continuous/Stitch Weld
Roof Curb Roof Curb
Concrete Structure
Ø 1
2
" Anchor Bolts at 6" centers,
(4" max' spacing from curb corner)
Wooden Structure
Ø 1
2
" Lag Bolts at 6" centers,
(to be determined by structural engineer)
Roof Curb
Structural Steel Support
Continuous/Stitch Weld
Roof Curb Roof Curb
Concrete Structure
Ø 1
2
" Anchor Bolts at 6" centers,
(4" max' spacing from curb corner)
Wooden Structure
Ø 1
2
" Lag Bolts at 6" centers,
(to be determined by structural engineer)
Roof Curb
Structural Steel Support
Continuous/Stitch Weld
Roof Curb Roof Curb
Concrete Structure
Ø 1
2
" Anchor Bolts at 6" centers,
(4" max' spacing from curb corner)
Wooden Structure
Ø 1
2
" Lag Bolts at 6" centers,
(to be determined by structural engineer)
Lag Bolts
Roof Curb
Curb Cap
Figure 2.
Roof Mounted AXTC Fan
Spring Isolator Rubber-In-Shear
Isolator
Hanging Spring
Isolator
Figure 3.
Vibration Isolators (Typical)