Air Louvers OFAL 300 SERIES
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1 Fresh / Exhaust Model : OFAL GI 359 Description: Stationary Louvers is designed to provide air intake and air exhaust openings in building exterior walls to protect against the direct ingress of rain. The blades are positioned on 93mm minimum centers up to 112mm maximum centers at 45 degree and has a high free area to provide minimum resistance to airflow. Standard Construction: FRAME: Gauge 16 ga. /18 ga. from formed Galvanized steel sheet. BLADES: Gauge 18 ga. / 20 ga. from formed Galvanized steel sheet. BIRD SCREEN: Galvanized steel, 12 x 12 x 1 mm (std. supply) MIN SIZE: 200 mm x 200 mm MAXIMUM SIZE: 1100 W x 2000 H as single section. Up to 2200 W x 2000 H as a single section with vertical mullion on center. Larger sizes will be in multiple sections. Optional extras: Code Z - Painted to RAL (Epoxy coated) Code I - Insect Screen in galvanized steel 1 x 1 x 0.4 mm Code T - Bird Screen in Stainless steel 5 x 5 x 0.7 mm OFAL AL 359 General construction as type OFAL GI 359 but frame and blades are built of mill finish aluminum. OFAL SS 359 General construction as type OFAL GI 359 but frame and blades are built from Stainless steel type 304. Model : OFAL GI 359
2 Assembly Single Section 1. Casing 2. Blade 3. Bird Screen Single Section with Mullion Multiple Section
3 Assembly Details Multiple Sections Vertical Joint Detail Horizontal Joint Detail
4 Technical Data: Louver Selection and Application: Application of stationary louver selecting velocity through free area that gives an acceptable pressure drop for intake and exhaust application. Louver Free Area Chart SELECTION PROCEDURE OF STATIONARY LOUVER: EXAMPLE: With given air volume: Select Fresh Air Intake Louver with a given air volume of 2 Cu. m./s and 4 m/s free area velocity. A. Determine Louver Free Area: Dividing the given air volume (2 Cu. m./s) by free area velocity (4 m/s, do not exceed to 4.2 m/s for fresh air intake application), the free area will be: Louver Free Area = = 0.5 M. Sq. B. Select a suitable louver from Free Area Chart, The following suitable louvers from Free Area Chart are: 1) 0.9 m Wide x 1.3 m High, 2) 1.2 m Wide x 1.0 m High, 3) 1.6 m Wide x 0.8 m High C. Check the pressure drop of the selected louver on the Pressure Drop Chart: The pressure drop across the selected size of louvers is 27 Pa.
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6 Fresh / Exhaust Model : OFAL AL 359 Description: Extruded Aluminum Stationary Louvers is designed to provide air intake and air exhaust openings in building exterior walls to protect against the direct ingress of rain. The blades are positioned on 104 mm minimum centers up to 118 mm maximum centers at 45 degree and has a high free area to provide minimum resistance to airflow. Standard Construction: FRAME: Extruded aluminum profile 1.5 mm thick. BLADES: Extruded aluminum profile 1.2 mm thick. STANDARD FINISH: Mill aluminum finish. SCREEN: Expanded aluminum bird screen. MINIMUM SIZE: 300 x 300 mm MAX SIZE: 1200 W x 2000 H - Larger sizes will be in multiple sections. Optional extras: Code A - Anodized aluminum in silver. Code P - Polyester powder coated. Code Z - Painted to RAL (epoxy coated) Code I - Expanded aluminum insect screen. Code T - Bird screen in stainless steel 5 x 5 x 0.7 mm. OFAL AL 350 General construction as type OFAL AL 349 but with drainable frame and blades. Drain gutter in each blade and downspouts in vertical frames allows water to drain from louver to minimize water cascade from blade to blade. Model : OFAL AL 349
7 OFAL AL 349 ( Single Section ) 1.Frame 2. Blades 3. Bird Screen OFAL AL 350 ( Single Section ) 1. Drainable Frame 2. Drainable Blades 3. Bird Screen
8 Technical Data OFAL AL 349 : Louver Selection and Application: Application of stationary louver selecting velocity through free area that gives an acceptable pressure drop for intake and exhaust application. Louver Free Area Chart SELECTION PROCEDURE OF STATIONARY LOUVER: EXAMPLE: With given air volume Select Fresh Air Intake Louver with a given air volume of 1 Cu. m./s and 3.5 m/s free area velocity. Determine Louver Free Area: D. Dividing the given air volume (1.5 Cu.m. /s) by free area velocity (3.5 m/s, do not exceed to 4.2 m/s for fresh air intake application), the free area will be: Louver Free Area = = M. Sq. E. Select a suitable louver from Free Area Chart, The following suitable louvers from Free Area Chart are: 1) 1.0 m Wide x 1.3 m High, 2) 1.2 m Wide x 1.1 m High, 3) 1.4 m Wide x 1.0 m High F. Check the pressure drop of the selected louver on the Pressure Drop Chart: The pressure drop across the selected size of louvers is 25 Pa.
9 Technical Data OFAL AL 349 :
10 Technical Data OFAL AL 349 :
11 Technical Data OFAL AL 350 : Louver Selection and Application: Application of stationary louver selecting velocity through free area that gives an acceptable pressure drop for intake and exhaust application. Louver Free Area Chart SELECTION PROCEDURE OF STATIONARY LOUVER: EXAMPLE: With given air volume Select Fresh Air Intake Louver with a given air volume of 1 Cu.m. /s and 3.5 m/s free area velocity. Determine Louver Free Area: G. Dividing the given air volume (1.5 Cu.m. /s) by free area velocity (3.5 m/s, do not exceed to 4.2 m/s for fresh air intake application), the free area will be: Louver Free Area = = M. Sq. H. Select a suitable louver from Free Area Chart, The following suitable louvers from Free Area Chart are: 1) 1.1 m Wide x 1.0 m High, 2) 1.3 m Wide x 0.9 m High, 3) 1.5 m Wide x 0.8 m High I. Check the pressure drop of the selected louver on the Pressure Drop Chart: The pressure drop across the selected size of louvers is 35 Pa.
12 Technical Data OFAL AL 350 :
13 Technical Data OFAL AL 350 :
STATIONARY LOUVERS STATIONARY LOUVERS STATIONARY LOUVERS
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