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MD ANDERSON Project No. XX-XXXX

MD ANDERSON PROJECT NAME

A/E Name

Issue Description

A/E Project No.

Month, 00, 0000

5.

Housings shall not exceed 21 inches in direction of airflow and shall be of all welded construction with factory prepunched standing flanges for ease of attachment to adjacent equipment and/or ductwork.  

6.

Doors are to be fitted with positive sealing, heavy duty multiple latches and with sponge neoprene gaskets.

C.

Unitary front access holding frames shall be fabricated of not less than 16-gage galvanized steel with holes pre-punched for convenient assembly into banks.  Frames shall be a minimum of 2-5/8 inches deep for maximum structural strength and resistance to racking.  All joints in the field-assembled banks of frames shall be thoroughly caulked to prevent bypass of unfiltered air between frames and surrounding ductwork or plenum chambers.  Frames shall each be fitted with polyurethane foam gaskets, held in place by long lasting adhesive and with a minimum of four heavy-duty spring type fasteners.  Fasteners shall attach to the frames without requiring tools and shall be capable of withstanding 25 pounds of pressure without deflection.

D.

Housings for disposable carbon panels shall be of modular design with each module designed to hold four (4) carbon panels and four (4) 1-inch type “C” filters in “V” shape.  Each module shall also be designed to accommodate one 4-inch Type “C” filter downstream of the four carbon panels and the four Type “C” filters.  Housing shall include all necessary hardware to mount panels and filters.

E.

Frames for filters with efficiencies greater than 95 percent shall be constructed of not less than 14-gage galvanized steel construction, factory fabricated and assembled.  Where the size of the filter bank is larger than can be fabricated in a single unit, the manufacturer shall provide modules to minimize the number of field joints.

2.07

Dampers

A.

Mixing Box Section or Outside Air Inlet Plenum Section:

1.

Factory built, field mounted, outside air damper shall be Type 304 stainless steel and edge seals in stainless steel frame, with stainless steel axles in selflubricating synthetic bearings.  Return or supply air dampers of heavy gauge extruded aluminum constructed frame and airfoil blades with galvanized steel tube axles, and self-lubricating nylon bearings.

2.

If a mixing box section then use opposed blade arrangement with damper blades and shaft lengths to be positioned across shortest frame opening dimension.

3.

If Air Inlet section only then parallel blade arrangement should be used when dampers are used for isolation purposes only.

4.

Provide removable, full width rack for supporting freeze protection thermostat, with removable end panel to permit rack removal.

B.

Damper Leakage:

1.

Maximum 4.0 CFM per square foot at 4-inches w.g. differential pressure.

2.

Outside air dampers shall be sized for a full open face velocity not greater than 600 FPM.

3.

Return air dampers shall be sized for a full open face velocity not greater than maximum 1500 FPM.

The University of Texas

CUSTOM AIR HANDLING UNITS WITH FAN ARRAY SYSTEMS

MD Anderson Cancer Center

23 73 24

MS041113

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