How do you calculate the size of a louver combustion air?
Step 6–To find the required grille/louvers size, you will need the Total BTUs of the appliances(from Line 1). The total BTUs should be divided by 1000. This will give you the SQUARE INCHES required to connect the spaces. Each room that is required for combustion air will need these grilles/louvers installed.
What is the minimum clearance required at the back and sides to the nearest combustible materials to an unlisted floor mounted household cooking appliance?
6 inches
Floor-mounted-type unit heaters shall be installed with clearances to combustible materials at the back and one side only of not less than 6 inches (152 mm).
What is the minimum vertical height of an attic space where combustion air is obtained?
Where combustion air is obtained from an attic area, the attic ventilating openings shall not be subject to ice or snow blockage, and the attic shall have not less than 30 inches (762 mm) vertical clear height at its maximum point.
When should combustion air not be drawn from inside a building?
Combustion air shall not be obtained from any location below the design flood elevation. 702.1 All air from indoors. Combustion and dilution air shall be permitted to be obtained entirely from the indoors in build- ings that are not of unusually tight construction.
At what CFM do you need make up air?
400 CFM
New building codes require what is called “make-up air” to be installed when a kitchen ventilation hood exceeds 400 CFM (cubic feet of air per minute). Many gas range and cooktop manufacturers recommend well over 400 CFMs for a ventilation hood especially when you exceed 4 burners on your appliance.
What is the maximum input rating allowed for an unvented heater installed in a bedroom according to NFPA 54?
A single wall-mounted unvented room heater is installed in a bedroom and such unvented room heater is equipped as specified in Section 621.6 and has an input rating not greater than 10,000 Btu/h (2.93 kW).
When installing above floor mounted food service gas appliances there should be a minimum clearance of 18 from combustible materials above any type of cooking top?
Chapter 9 Installation of Specific Appliances
| Adopting Agency | HCD | OSHPD |
|---|---|---|
| Adopt Entire Chapter as amended (amended sections listed below) | X | X |
| Adopt only those sections that are listed below | ||
| Chapter/Section | ||
| 902.2 | X |
Can attic combustion air be drawn?
It’s OK for the ducts to pull combustion air from the crawl space or attic as long as those spaces communicate directly with the outdoors. In the first diagram, the low vent is connected to the vented crawl space, and the high vent is connected to the attic.
How close can a cold air return be to the furnace?
Return air cannot come from a closet, bathroom, kitchen, garage or mechanical room. If the sole source of return air is in the same room as unit, the return source must be located more than 10 feet from the unit.
Do gas dryers need combustion air?
A gas dryers energy input ranges up to 35,000 btus per hr regardless of exhaust rate. Which at a rate of 10 to 1 for complete combustion is 350 cubic feet per hour. Therefore a dryers combustion air is only about 3 percent of the total air required for dryer operation.
What do you need to know about combustion air requirements?
Combustion appliances require 50 cubic feet per 1000 BTU per hour (BTU/h) aggregate input. “Aggregate” means that if two combustion appliances such as a gas-fired furnace and a gas-fired water heater share the space providing combustion air, each of their input ratings in BTU/h must be included when calculating adequate combustion air.
What do you need to know about IFGC Chapter 6?
About this chapter: Similar to Chapter 9 of the International Mechanical Code ®, Chapter 6 of this code addresses specific types of appliances in detail. Requirements include listing and labeling, installation, location, clearances, venting and exhausting, controls, support and combustion and ventilation air.
What are the regulations for gas fired appliances?
This chapter shall govern the approval and installation of all equipment and appliances that comprise parts of the installations regulated by this code in accordance with Section 101.2. The requirements for combustion and dilution air for gas-fired appliances shall be governed by Section 304.
When do you use aggregate for combustion air?
“Aggregate” means that if two combustion appliances such as a gas-fired furnace and a gas-fired water heater share the space providing combustion air, each of their input ratings in BTU/h must be included when calculating adequate combustion air.
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