Typical wall penetration with mechanical duct
Subjects being investigated are ribbed round duct, fatique testing of tie rodded metal, new flat oval duct standards, duct liner pin lengths, more double wall casings, sealant specifications and more performance specifications for joints and reinforcements. Nonmetal ducts are available in a wide variety of materials and nominal shape-retaining reinforcements. The purpose of these data sheets is to acquaint the air conditioning engineer with means for shielding ductwork and other openings that penetrate protective barriers around radiation facilities, particularly X-ray rooms. However, SMACNA does encourage the development and use of new technology and it invites authorities to consider alternative constructions. Where fittings of comparable or better performance are illustrated in duct design handbooks, designers are encouraged to consider allowing a substitution. Oral and written interpretations otherwise obtained from anyone affiliated with the Association are unofficial. Among the deliberations that designers should consider in the selection of louvers, rooftop ducts, curbs, ventilators, supports, and other components are the following.
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Penetrant (mechanical, electrical, or structural)
Otherwise, if the bar or angle must be aluminum, change the thickness and dimensions as necessary to accommodate the aluminum extrusions. It seems straightforward enough, but it is not typically a step-by-step process. In the table, an entry such as HG means that the H reinforcement size may be downsized to a G per section 1. Seams shall be formed and assembled with proper dimension and proportion for tight and secure fit up. For beading or crossbreaking, see Fig.
Fire Duct Systems
The static pressure, differential orifice pressure, and sheet displacement were simultaneously recorded on an oscillograph chart. Surfaces to receive sealant should be clean, meaning free from oil, dust, dirt, rust, moisture, ice crystals, and other substances that inhibit or prevent bonding. The load can be transferred to the riser support by angles or by rods. The consultants had seen fatigue failure only in cases of much more severe vibration, usually where there were stress reversals such as that created by a poorly secured turning vane flapping in the airstream. The wiring in the cells and the concrete above the deck preclude the use of fasteners, such as sheet metal screws, that must pierce the deck. The motor supplier should select operators carefully.
For columns 3 through 9, see Introduction to Schedules. Generally, the first step is to pack the opening with forming material such as glass fiber, backer rod, or mineral wool. Drainage facilities must be provided in the coil and eliminator sections of the casing to handle condensation on the cooling coil. Where sealing is required in Table or in other tables or illustrations in this manual, it means the following:. See qualification as reinforcement in Table ASTM-A covers the structural grade of stainless steel not used for ducts. As the industry develops more experience with these in installation and service, and as more functional performance criteria are identified, it is anticipated that such forms will be added to SMACNA construction standards.