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Kennel Ventilation – Supply and Exhaust
Properly designed ventilation can reduce or eliminate odors, reduce bacteria build-up, and help keep that fresh clean smell in your mouth. Your pets will be happier and you’ll spend less time trying to dry floors and eliminate odors. If you have trouble understanding the information in this article, email us online at Sun Hill Pet Supplies.
No matter the size of your venue, the atmosphere will play a major role in the first impression of your guests. Simply put, the air is controlled, the movement of the air is controlled.
Basics of design:
- Air traffic: change all the air in the room four to six times in an hour. Calculate the volume of the room in cubic feet, multiply the result by four, five or six, then divide by sixty to find the air volume, in cfm (cubic feet per minute).
- Exhaust pick-up points: Most bird odors are created at the same level as dogs, so place the exhaust pickup points less than 30 inches to direct the odor downward, away from your nose. However, not less than twelve inches from the floor to prevent cleaning water from entering the ventilation system.
- Some exhaust pick up points: Many points throughout the room have a chance for air movement to flow properly. Remember we are not talking about the return air duct of your heating system, we are talking about the exhaust vents to remove the air from the room.
- Air conditioning: Install your air supply valves high in the room. This allows the air to flow downwards towards the exhaust intake points, thus eliminating odors, and away from your nose. Remember, the supplied air must be filtered and conditioned, (heated or cooled), not raw outside air. Your HVAC contractor can install a unit that supplies enough fresh air to the air conditioning system to meet supply requirements.
- Position of air supply and air outlet: Place the supply pipes on the ducts and place the exhaust points at the back of the ducts in the walls or as pipes coming down from the walls. If the heating source is a “hot air” system, one-third of the heated air should be placed on the floor and two-thirds through the ductwork.
- Exhaust fan type and design: You want to use a fan with a centrifugal wheel as the air circulation. Fans and blowers that use a draft similar to that of a window fan will not be able to overcome the static pressure created by the duct for the many required lift points.
- Blower size: A factor of safety by multiplying the cfm you calculated in step #1 by 1.5 to insure your adequate air flow, then select the exhaust valve to ½ that amount of cfm ” change to static pressure or higher. Static pressure is the resistance to air flow, usually created by the duct system.
- Channel size: High air velocity in the system will ensure good air flow, so increase the air velocity of the ducts to about 2000 fpm (feet per minute). The simplest approach to sizing is to determine the duct size needed to handle the full airflow, then install that size as the primary duct, throughout the building. Determine the number of drops you want and divide the primary channel area by the number of drops. Each drop is then measured in that area. Use this formula to determine the basic duct size: (cfm / 1500fpm) x 144 = duct area in square inches
Formula information: · http://www.Grainger.com is a great resource for blowers.
· Area of a circle: radius squared times 3.14 ( [r x r] x 3.14) Sample area of 3″ round duct: (1.5 x 1.5) x 3.14 = 7.065 square inches
· convert square inches to square feet: divide square inches by 144. From the example above, divide 7.065 square inches by 144 = .049 square feet.
Example:
1. A laundry room is 20 ft x 15 ft with a 10 ft high ceiling: 20 x 20 x 10 = 4000 cubic feet
2. Five (5) air changes per hour = 4000 x 5 = 20,000 cubic feet
3. Set Cfm (cubic feet per minute) to 20,000 / 60 = 333 cfm
4. Safety factor air flow: 1.5 x 333 = 500 cfm
5. From Grainger’s: http://www.grainger.com/Grainger/items/2C946 This blower pumps out 537 cfm at ½” of static pressure, and is only $165.38 and can be attached to most outlets.
6. Primary duct size in square inches: (500cfm / 2000 fpm) x 144 = 36 square centimeter. You can use a 6′ x 6′ square channel, or a 7″ round channel.
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