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Kennel Ventilation – Supply and Exhaust
Properly designed ventilation can reduce or eliminate odors, reduce bacteria build-up, and help maintain a fresh clean smell in the kennel. Your pets will be happier and you’ll spend less time drying floors and removing odors. If you have trouble understanding the information in this article, email us at Sun Hill Pet Supplies on the web.
Regardless of the size of your facility, ventilation will play a key role in visitors’ first impression of the kennel. Simply stated, ventilation is controlled, directed air movement.
Design Basics:
- Air exchanges: Change all the air in the room four to six times an hour. Calculate the room volume 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).
- Exit pick-up points: Most kennel odors are created at the same level as the dogs so keep your exhaust pick up points less than 30 inches to ensure odors are drawn down away from your nose. However, not less than twelve inches from the floor to prevent clean water from entering the ventilation system.
- How many exit points: Multiple points throughout the room ensure that air movement has a chance to circulate properly. Remember we’re not talking about air ducting back into your heating system, we’re talking about exhaust vents to remove air from the room.
- air supply: Install your air supply vents, high up in the room. This allows air to flow down to the exhaust pick up points, causing odors to be pulled down, and away from your nose. Remember, the supply air must be filtered and tempered, (hot or cold), not raw outside air. Your HVAC contractor can install a unit that provides enough fresh air in the ventilation system to meet supply requirements.
- Position of air supply and exhaust vents: Place supply vents in corridor paths and exhaust pickup points in the form of pipes behind runs in walls or down walls. If the heating source is a “hot air” system, introduce one-third of the heated air to the floor and two-thirds through the vents to the corridor passages.
- Type and design of exhaust fans: You may want to use a blower with a centrifugal wheel as an air mover. Fans and blowers that use the same blades as window fans will not be able to overcome the static pressure created by the ductwork required for multiple pickup points.
- Size the blower: Create a safety factor by multiplying the cfm you calculated in step #1 by 1.5 to ensure you have enough airflow, then choose an exhaust blower to move the amount of cfm at ½” of static pressure or higher. Static pressure is resistance. Airflow, Usually created by a duct system.
- Duct sizing: High air velocity in the system insures good air flow so size the ducts for an air velocity of about 2000 fpm (feet per minute). The easiest approach to sizing is to determine the duct size needed to handle the total airflow, then, throughout the building, install that size as the primary duct. Determine the number of drops you want and divide the area of the primary duct by the number of drops. Each drop is then shaped into that area. Use this formula to determine primary duct size: (cfm / 1500fpm) x 144 = duct area in square inches
Formula Info: · http://www.Grainger.com is an excellent resource for blowers.
· Area of a circle: Radius squared times 3.14 ( [r x r] x 3.14) Example of the area of a 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 kennel 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. Determine cfm (cubic feet per minute) 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 moves 537 cfm at ½” constant pressure, and is only $165.38 and can be plugged into multiple outlets.
6. Primary duct size in square inches: (500cfm / 2000 fpm) x 144 = 36 square inches of duct. You can use 6′ x 6″ square duct, or 7″ diameter round duct.
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