Design and Specification Guidelines - Gaston County Schools

Design and Specification Guidelines Gaston County Schools
Updated: March 6, 2012 Gastonia, NC 28054
J. Variable Frequency Drives (VFD’s)
1. VFDs should be utilized for energy savings or system control requirements. All
VFDs should have integral MCP disconnects, door-mounted keypad,
HOA/bypass selector switches, and direct communications interface to building
EMS. Line and output reactors should be used per manufacturer
recommendations.
K. Ductwork
1. Ductwork shall be constructed per latest version of applicable SMACNA duct
design guidelines. All ductwork shall be seal class A. For work in occupied
buildings, field applied sealants must be free of noxious fumes (water based).
Design Drawings must indicate duct pressure classifications and leakage class.
Galvanized duct thickness shall be as prescribed by SMACNA, except 24 gage
shall be the minimum thickness permitted. For moisture laden air (laundry,
shower, etc. exhaust) use aluminum grills and registers, aluminum or stainless
steel duct, pitched to drain condensate. For dishwasher exhaust use stainless
steel
2. Designer shall coordinate to insure that there is sufficient access around piping
and ductwork in the field to install and seal joints on insulation system. It is
crucial that systems operating at temperatures below ambient dewpoint have
continuous unbroken vapor barriers.
3. Exposed ductwork in mechanical spaces or other areas of heavy traffic, shall
be insulated using fiberglass board with minimum 4.2#/c.f. density and foil
facing. Joints shall be taped with foil tape. Secure board with field glued pins
and speed washers. Pins to be clipped flush after washer installation. Where
ductwork is concealed and protected from damage use duct wrap blanket
secured with pins and washers.
4. No Lined Duct Work Permitted.
5. Duct sox can be used where appropriate.
L. Air Distribution
1. Diffusers shall be square, louver face, adjustable pattern, multicore type to
discharge air in 360 degrees pattern. Diffusers shall be steel off-white baked
enamel factory finish except kitchen area shall be aluminum/perforated
coordinated not to interfere with hood airflow.
M. Filters
1. Standard Size must be specified – No odd sizes
2. Prefer filter changed in closet– Prefer access from corridor rather than
classroom (may be difficult to apply to renovation)
3. Access to filter required
N. Exhaust Fans (T-Stat)
1. Exhaust fan locations
a) Toilets
b) Workroom (will identify on a project basis)
c) Custodial closets
d) Electrical & Server room (T’Stat)
e) Undercut door for supply (Do Not Compromise Fire Rating)
*=Preferred Brand; Bid Alternate Required Page 24 of 38 Pages