Micrometl Knockdown Curb Installation Manual
Knockdown Curb
Install Guide
Foremost HVAC Accessory Manufacturer
Table of Contents
Topic Page Number
Topic Page Number
General 1
General 1
Knockdown Assembly 2
Cut Opening 3
Flashing The Curb 4
Duct Attachment 5
Apply Gasket 6
Equipment Supports 7
IMPORTANT: Please read all installation instructions and safety precaustions before beginning. These
installation instructions are to be used as a general quideline only!
GENERAL
The MicroMetl Knockdown Curb ships unassembled, can be easily
stored in your inventory, and is your least expensive option when it
comes to rooftop curbs. With the use of some basic tools, it is easily
eld assembled.
The most common curb height is fourteen inches. MicroMetl offers
other standard heights, as well as your choice of any pitch, or custom
height variation, to best t your rooftop requirements. Please contact
Customer Service with your special requests and requirements.
SAFETY PRECAUTIONS
Improper installation, adjustment(s), alteration(s), service or
maintenance can cause property damage, injury or death.
Installation and servicing of air-conditioning equipment can be
hazardous due to system pressure and electrical components.
Only trained and qualied service personnel should install, repair,
or service air-conditioning equipment.
Untrained personnel can perform basic maintenance functions
such as replacing lters. All other operations should be performed
by trained service personnel. When working on air-conditioning
equipment, always observe precautions in the literature, tags and
labels attached to the unit, and other safety precautions which may
apply!
To avoid any property damage or personal injury, it is the installer’s
responsibility to be certain that the installation will not impair the
function of this curb, or the unit to be installed.
Check and disconnect all gas and electrical connections before
installing your new curb and rooftop unit.
WARNING
!
To prevent injuries and rain damage, do not leave roof
opening uncovered. If installation is not completed
immediately after roof opening is cut and framed, provide
an adequate temporary cover for the roof opening.
TOOLS NEEDED
Rubber Mallet
5/16” Hex Head Driver or Socket
Tape Measure 7/16” Socket
7/16” Combination Wrench
Level
UNPACK & INSPECT
Reference the Product Submittal for your specic part number and an
illustration of all necessary parts. Unpack, locate all parts, and inspect
curb for missing parts or damages. Contact MicroMetl’s Customer
Service Department immediately with any questions or concerns.
All hardware used for these assembly procedures is included with
your curb. Do not tighten any hardware until the curb is completely
level, square, and installed in a suitable position on the roof with
proper alignment to the roof/unit opening(s).
OBSERVE PROPER CLEARANCES AND
OBSTRUCTIONS
Before installing your roof curb, check unit nameplate or RTU
manufacturer’s weight, and observe their requirement(s) for correct
and proper clearances. Additionally, check the clearances of the
new unit to other items on the roof, exhaust fans, walls, and other
roof top units.
Secure any wiring or pipes arising through the curb to be connected
to the new rooftop unit. Be certain to identify any possible obstructions
which could interfere with a crane’s path if required.
1
ASSEMBLE SIDES AND ENDS USING
MICROLOCK TABBED ENDS
The tabbed ends were developed at MicroMetl allowing the curb to
be assembled with just a rubber mallet. Bring together a curb side,
and a curb end. Simply t the tab into the slot, and with minimum
pressure, the corners securely lock into place. Be certain not to
join incorrect pieces. This style curb requires much more effort to
disassemble. Do not strike with too much force and damage the
curb. Repeat for the assembly of all corners.
90 DEGREE JOINING BRACKETS
Some long curb sides and ends may require a joining bracket. The
joining bracket combines long pieces together using the provided 90
degree corner bracket as shown in Illustration - 90 Degree Joining
Brackets. Place and secure the metal brackets on the inside of
the curb. It is designed to align with the pre-punched holes in the
knockdown curbs where the seams join, and must be installed on
the inside of the curb. Insert supplied bolts from the outside of the
curb, and through the brackets where the two anges meet, secure
into place. Insert wood screws at the top of the bracket and insert
from the inside of the curb.
Wood screws at top only
Curb Side Brackets
(Use 2 corner brackets
per side)
Curb Short Side
Tabbed End Slotted End
Illustration - Sides & Ends Assembly
JOINING BRACKETS
Some long curb sides and ends may require a joining bracket which
combines long pieces together using the factory provided at bracket
as shown in illustration - Joining Brackts. It is designed to align with
the pre-punched holes in the knockdown curbs where the seams
join, and must be installed on the inside of the curb. Insert supplied
bolts from the outside of the curb and secure. Insert wood screws at
the top of the bracket and insert from the inside of the curb.
Wood screws at top only
Joining Bracket
Illustration - 90 Degree Joining Brackets
ASSEMBLE SIDES & ENDS
90 DEGREE CORNER BRACKET
Bring together curb side and curb end. Place the small corner bracket
on the inside of your new knockdown curb and align with the prepunched holes. Insert the bolts from the outside of the curb. Repeat
for the assembly of all corners.
Wood screw
at top only
Bracket
Illustration - Joining Brackets
2
Illustration - Sides & Ends
Corner Bracket Assembly
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