STANDARD	9 Nov 1998	15181

UPDATES -

SECTION 15825

SIDE ACCESS HOUSINGS AND FILTERS

PART 1 GENERAL

1.1	SUMMARY

A.	Includes But Not Limited To

1.	Furnish and install housings and filters in specified ductwork as described in Contract Documents.

B.	Related Sections

1.	Section 15051 - General Mechanical Requirements	15051

2.	Section 15081 - Ductwork Insulation

1.2	REFERENCES

A.	American Society for Testing and Materials -

1.	ASTM A653-96, Standard Specification for Steel Sheet, Zinc-coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

2.	ASTM C665-96, Standard Specification for Mineral-Fiber Blanket Thermal Insulation for Light Frame Construction and Manufactured Housing

3.	ASTM C1071-91, Standard Specification for Thermal and Acoustical Insulation (Glass fiber, Duct Wrap Material)

PART 2 PRODUCTS

2.1	COMPONENTS

A.	Housings

Include this optional paragraph '1' if standard 90 percent efficient furnaces are used.

Include this optional paragraph '1' for furnaces other than standard 90 percent efficient furnaces and for other equipment listed.

1.	Fabricate of not less than 16 gauge zinc-coated lockforming quality steel sheets meeting requirements of ASTM A653, with G-60 coating.

2.	Shall incorporate two (2) access doors, extruded aluminum tracks and individual holding frames designed to accommodate the standard size, high efficiency, filter enclosing frame.

B.	Enclosing Frame

1.	Fabricate of zinc-coated quality steel, assembled in such a manner that a rigid and durable enclosure for the filter pack is effected.

C.	Prefilters

1.	Each filter shall consist of a non-woven cotton fabric media, media support grid, and enclosing frame.

2.	Filter shall be capable of being installed or removed without disturbing the seal on the filter.

3.	Provide as a 4" or 2" medium efficiency, pleated, disposable type.

D.	Filters

1.	Filter Media shall be of high density microfine glass fibers, laminated to a reinforcing backing to form a lofted filter blanket.

2.	Filter media shall have an average efficiency of 90% - 95% on ASHRAE Test Standard (52.1-92) and be listed by Underwriters' Laboratories as Class (2)(1).

E.	Pressure Gauge

1.	Magnehelic air pressure gauge capable of indicating minimum of 1½" static pressure, equal to Dwyer 2000 Series.

F.	Insulation

1.	Entire unit housing and access doors shall be double wall with insulation between walls. Insulation shall be thermal, acoustical glass fiber, 1" thick with a thermal conductivity of 0.25 to 0.30 K and a bond strength of 20 PSF, based on S-08B modified. It shall withstand 250°F, meet hazard standards of NFPA 90A, and be tested in accordance with ASTM-E84. Flame spread rating shall be 25 with a maximum smoke development of 50.

G.	Leakage

1.	At rated airflow, upstream to downstream of filter, holding frame and slide mechanism shall be less than 1% at 3" w.g. differential.

2.	Into housing frame ambient atmosphere at rated airflow shall be less than 0.5% at 3" w.g. negative. Manufacturer shall submit substantiating test reports.

H.	Approved Manufacturers -

1.	Farr Company - 3P Glide/Pack - 36" x 24"

PART 3 EXECUTION

3.1	INSTALLATION	Installation

A.	Interface with other work. Reseal housing joint duct connection leaks discovered during air test and balance procedures specified in Section 13352 at no additional cost to Owner.

B.	Housing

1.	Securely anchor ducts to building structure with specified hangers/supports attached with screws.

2.	Brace and install housing so they shall be free of vibration under all conditions of operation.

3.	Cover horizontal and longitudinal joints on exterior housings with two layers of hardcast tape installed with hardcast RTA-50 adhesive according to manufacturer's recommendations.

Include paragraph '2' if standard 90 percent efficient furnaces are used.

END OF SECTION