PERFORMANCE STANDARDS

Modeling programs that describe Thermal Efficiency, Acoustical Performance, Light Wave Sensitivity and Structural Performance reports are also available from information supplied on the PROSPEC document. Currently used program models include WINDOWS 3.1, a thermal performance model developed by Lawrence Berkeley Laboratory for the United States Department of Energy; ACCOUSTICAL GLAZING DESIGN PROGRAM from Monsanto Company and Guardian Industries STRUCTURAL PERFORMANCE MANUAL.

Specific performance reports are available for several Woodstone products that have been tested under ASTM performance certification procedures at UNITED STATES TESTING COMPANY, INC. (Not affiliated with U.S. government). However, because our products are custom manufactured to unique specifications, standard performance certification standards do not apply. Performance certification on specific product can be provided only when formal testing of actual units designed for a given project is completed. Furthermore, it is the clients responsibility to determine the fitness of a product for specific applications. If there is any question concerning the

appropriate site application of a Woodstone product, the client should consult an architect or engineer. Woodstone provides performance certification services including Air and Water Infiltration, Structural and Acoustical Performance and Fire Resistance. Performance results currently on file for specific window applications include Air & Water Infiltration and Structural & Acoustical performance.

Wood Window & Door Standards: ANSI/NWWDA I.S. - 2.

Grade 20: (Residential)

A. Air Infiltration may not exceed .34 cfm/lineal ft. of opening crack @ 1.56 psf pressure differential.

B. Water Penetration not allowed @ 2.86 psf pressure differential.

C. No glass breakage, damage to hardware or permanent deflection greater than .4% of span @ 20 psf.

D. Operating Force may not exceed 25 lbs.

E. Design Load shall meet or exceed 13.3 psf.

Grade 40: (Light Commercial)

A. Air Infiltration may not exceed .25 cfm/lineal ft. of opening crack @ 1.56 psf pressure differential.

B. Water Penetration not allowed @ 4.43 psf pressure differential.

C. No glass breakage, damage to hardware or permanent deflection greater than .4% of span @ 40 psf.

D. Operating Force may not exceed 30 lbs.

E. Design Load shall meet or exceed 27 psf.

Grade 60: (Heavy Commercial)

A. Air Infiltration may not exceed .10 cfm/lineal ft. of opening crack @ 1.56 psf pressure differential.

B. Water Penetration not allowed @ 6.24 psf pressure differential.

C. No glass breakage, damage to hardware or permanent deflection greater than .4% of span @ 60 psf.

D. Operating Force may not exceed 35 lbs.

E. Design Load shall meet or exceed 40 psf.