Protector® XL™ Pass Through Benchtop Laboratory Hoods
LABCONCO PANEL-LINED PASS THROUGH FUME BENCHTOP HOOD SPECIFICATION
BY-PASS REMOTE BLOWER UNITS
PART 1 - GENERAL
1.01Scope and Classification
1.01.01This specification covers the requirements for the purchase of bench-mounted panel-lined pass through laboratory fume hood for remote exhaust blower systems. It is written to cover the by-pass design configuration, vapor-proof electrical configurations and with or without end viewing window available on these hoods.
1.01.02Bench-mounted laboratory fume hoods in 4, 5, and 6 feet widths and internal depth of 24 inches are covered by this specification.
1.01.03This specification sets the intent for quality, performance and appearance.
1.02Requirements:
1.02.01Laboratory hoods are of double wall construction with epoxy-coated, cold rolled steel exterior and 3/16" sheet molded composite board internal liner and baffle. The 4, 5 and 6 foot hoods have two single sashes of 3/16" thick tempered safety glass with counterbalance weights. Viewing height is 32.15". Sash opening height is 26.0". Hoods are provided with an air foil across the bottom of each sash area with 5 rows of perforations to maintain airflow should the operator inadvertently block the airflow. Access for maintenance is from the front and exterior. All hood-mounted service fixtures, where provided, are pre-plumbed except for the inlet tubing. All electrical services shall be pre-wired to a single point internal junction box at the top right of the hood (on vapor-proof models only). Hood is one-piece construction. Hoods passes through a 34" opening without disassembly.
1.03Quality Assurance:
1.03.01The hood manufacturer maintains a testing facility at its place of business for the testing of bench-mounted laboratory hoods in accordance with ASHRAE Standard 110-95. Both hoods and installation are in conformance to good construction practice and approved by the owner/user. Only fume hood manufacturers who have had fume hoods as a principal product for ten years will be considered. The hood manufacturer's manufacturing and test facilities and its quality control procedures must be available for owner/user inspection.
1.04References:
1.04.01The laboratory hoods conform to the following regulations and standards:
SEFA - #1 (Laboratory Fume Hoods)
NFPA - #45 (Fire Protection for Laboratories Using Chemicals 2000) sections 6-1 through 6-14
ASTM-E-84 - Surface Burning Characteristics of Building Materials
ASHRAE-110-95 (Method of Testing Performance of Laboratory Fume Hoods)
ANSI - Std. Z 9.5 (Laboratory Ventilation)
UL Standard 3101 (Electrical Wiring)
UL-1805 (Hood Construction)
CAN/CSA Standard C22.2 No. 1010.1
1.05Submittals:
1.05.01Laboratory hood specification sheets and product manuals are submitted by the hood manufacturer upon request. The hood supplier submits shop drawings when necessary for clarification.
1.05.02Sample pieces of the hood exterior wall material, interior liner and baffle material, work surface material, and color selection chips are available from the hood manufacturer upon request.
1.06Delivery and Storage:
1.06.01Laboratory hoods and work surfaces are delivered adequately protected from damage during shipment.
1.07Warranty
1.07.01Manufacturer's warranty against defects in material or workmanship on its fume hoods shall be for 1 year from date of installation or 2 years from date of purchase, whichever is sooner, includes replacement of parts (except lamps) and labor.
PART 2 - PRODUCTS
2.01Acceptable Manufacturer:
2.01.01Labconco Corporation, 8811 Prospect Avenue, Kansas City, Missouri 64132, Protector XL Pass Through Laboratory Hoods, model numbers as follows:
4' Models: 9942402, 9942403
5' Models: 9942502, 9942503
6' Models: 9942602, 9942603
2.02Materials:
2.02.01Hood exterior construction is 20 gauge (or heavier) cold rolled sheet steel or galvanized steel supports. All exterior painted surfaces are baked on, dry powder epoxy applied electro-statically. Base metal material will be properly prepared for epoxy coating.
2.02.02Hood interior liner and baffles are sheet molded homogenous polyester panels. Baffles sinclude chemical-resistant polyester brackets for support. Minimum thickness shall be 3/16". Flame spread is less than or equal to 25 per ASTM E-84.
2.02.03Corner posts are 16 gauge cold-rolled steel with epoxy-coated finish.
2.02.04 Exhaust connection is epoxy-coated 316 stainless steel.
2.02.06Hood sashes are 3/16" thick tempered safety glass surrounded by an epoxy-coated aluminum and PVC frame.
2.02.07 The sash tracks shall be epoxy-coated steel.
2.02.09Sash foils shall be 18 gauge epoxy-coated cold-rolled steel and have 5 rows of perforations.
2.03Specific Fabrication Requirements:
2.03.01Overall exterior dimensional information is as follows:
NOMINAL DIMENSIONS OF HOODS
4 ft.48" w x 59" h x 33.2" d
5 ft.60" w x 59" h x 33.2" d
6 ft.72" w x 59" h x 33.2" d
2.03.02The Pass Through bench-mounted laboratory hood with by-pass design minimize face velocity fluctuations as either sash is raised or lowered. With the sash positioned six inches above the air foil, the average inflow velocity will not be less than twice the selected full open face velocity nor greater than three times that amount.
2.03.03 Exhaust air volume requirements and static pressure losses will be as described in the table.
2.03.04The hood shall feature one exhaust connection and will be 10.09" ID.
2.03.05Right-hand corner post will have ADA-compliant light and blower switches and one electrical receptacle box and cutout for face velocity alarm. The three other corner posts are factory prepared to accept one electrical duplex.
2.03.06The perforated air foils are located directly across the bottom of the sash openings to allow the air to bypass underneath and through the foil and sweep across the work surface to prevent any back flow of fumes escaping from the front of the hood. The foils is at least 4" wide and extend back under the sashes to prevent closure of the lower by-pass opening when the sashes are in the fully closed position. The air foils have a large aerodynamic radius to sweep the air into the hood with minimal turbulence and perforated to pull inflow air from beneath so that clean air continually flows over the foils creating a constant protective barrier from contaminants. This airflow continues even if blocked by the presence of the operator.
2.03.07The front and side exterior of the hood feature baked on powder epoxy paint applied electro-statically.
2.03.08The interior liner and baffle is cut to fit in terms of size and securely held in place with supports. Baffle shall be removable for cleaning.
2.03.09The hoods have two single vertical-rising sash counterbalanced by independent sash weights suspended by two vinyl-coated stainless steel cables that pass through ball bearing pulleys. Each sash operates smoothly without tilting when raised or lowered from either end and remain at rest in any open position. All sashes are framed with extruded epoxy-coated aluminum and PVC.
2.03.10The fume hood features a sash alarm. Only one sash is open at a time. If the second sash is raised, an audible alarm will sound until one sash is closed.
2.03.11Fume hood models with viewing window provide a 15" x 24" viewing window on the right side of the hood for additional observation. Window is clear tempered safety glass.
2.03.12Vapor-proof hood models are provided with one vapor proof incandescent light fixture. Hoods are provided with a light switch, blower switch, and all internal wiring to a single point internal junction box.
2.03.13The vapor-proof hoods accommodate up to four 115 volt, three-wire polarized and grounded electrical duplex receptacles as required.
2.03.14Work surfaces (not included with hood) are available with 6" x 3" oval epoxy cupsink(s) featuring 1-1/2" drain connection as well as other sink cutout requirements upon request. A work surface with a 1" leading edge radius is recommended (consult Labconco).
2.03.15Fire suppression system (not included with the hood) is available as an option for installation on the hood's interior. Consideration should be given to the explosion-proof version for these hoods (contact Labconco).
2.03.16Face velocity alarms to monitor hood performance (not included with hood and not available on explosion-proof hoods) are recommended and are available for factory or field installation.
PART 3 - EXECUTION
3.01Examination
3.01.01Verify equipment rough-in before proceeding with work.
3.01.02Coordinate with other trades for the proper and correct installation of plumbing and electrical rough-in and for rough opening dimensions required for the installation of the hood.
3.02Installation
3.02.01Install according to manufacturer's instructions.
3.02.02Install according to standards required by authority having jurisdiction.
3.02.03Install equipment plumb, square and straight with no distortion and securely anchor as required.
3.02.04Sequence installations to ensure utility connections are achieved in an orderly and expeditious manner.
3.02.05Touch up minor damaged surfaces caused by installation. Replace damaged components as directed by Architect.
3.03Adjusting
3.03.01Adjust operating equipment, with exception of air moving equipment, to efficient operation for its intended use, and as required by the manufacturer.
3.04Cleaning
3.04.01Clean equipment, casework, countertops and all other surfaces as recommended by the manufacturer, rendering all work in a new and unused appearance.
3.04.02Clean adjacent construction and surfaces that may have been soiled in the course of installation of work in this section.
3.05Protection of Finished Work
3.05.01Provide all necessary protective measures to prevent exposure of equipment and surfaces from exposure to other construction activity.
3.05.02Advise contractor of procedures and precautions for protection of material and installed equipment and casework from damage by work of other trades.
3.06Demonstration
3.06.01Provide systems demonstration and demonstrate all equipment operations and functions.
APPENDIX - TESTING CRITERIA
X.X.XReverse Airflows and Containment - When tested as "As Manufactured" ("AM"), the hood provides containment less than or equal to 0.10 ppm when tested per ASHRAE Standard 110-95 and under the conditions specified in section X.X.X.01 of this specification.
X.X.X.01Test Criteria: The following test criteria apply when determining the AM performance rating.
Face velocity: 100 feet per minute ±20% with only one sash open. Ambient temperature: 68 to 74 degrees F
X.X.X.02 Containment per ASHRAE 110-95 - At a tracer gas release rate of 4 liters per minute, the AM leakage shall not exceed 0.10 ppm (rating = 4 AM 0.10)
X.X.X.03 Flow Visualization - The following excerpt sections of ASHRAE 110-95 are used to define the AM test criteria for reverse airflow and exhaust capacity.
X.X.X.03.01 Flow Visualization - Swab a strip of titanium tetrachloride along both walls and the hood floor in a line parallel to the hood face and 6 inches (152 mm) back into the hood. (Titanium tetrachloride is corrosive to the skin and extremely irritating to the eyes and respiratory system.) Define air movement toward the face of the hood as reverse airflow and define lack of movement as dead air space. Swab the work surface, making sure to swab lines around all equipment in the hood. All smoke should be carried to the back of the hood and out. Test the operation of the lower air bypass air flow opening by running the cotton swab under the air foil. Before going on to the next test, move the cotton swab around in the face of the hood. If there is any outfall, the exhaust capacity test should not be made.
X.X.X.03.02 Exhaust Capacity - Ignite and place a 30-second smoke bomb near the center of the work surface, making sure that the hole on the side of the smoke bomb faces into the hood. After the smoke bomb begins to work, pick it up with tongs and move it around in the hood. There should be no visual or odor indications of smoke outside the hood.
X.X.X.04 Installed Performance - Per ASHRAE 110-95, the "AU" (As Used) requirement involves the design of the room supply system and the toxicity of the materials handled in the hood. The AU specification should be tailored to suit the needs of the laboratory room location.