1 Ventilation ASHRAE 62.2 COMPLIANCE How do we get there? Bruce Hagen ND Dept. of Commerce /NDCommerce /NDCommerce /NDCommerce /NDCommerce
2 WHATS NEW IN ASHRAE Controls (Override) Shutoff for maintenance or outdoor air issues (humidity, pollutants) Includes Switch Dedicated circuit breaker Fan controls Extension cord Must be labeled Multifamily switch does not need to be accessible to the occupants
3 WHATS NEW IN ASHRAE Floor area definition based on finished space Shouldn t change how we are doing it Applies to all multi-family dwelling units not common areas (hallways, laundry rooms, etc.) Those are covered by 62.1
4 WHATS NEW IN ASHRAE Multifamily Infiltration Credit now available Only for horizontally attached units (row houses, town houses, etc) Reduced by the surface area adjacent to other units or garages Must still meet compartmentalization requirements use blower door and infrared camera
5 WHATS NEW IN ASHRAE Multifamily Infiltration Credit 3040 sq ft surface area in each unit End units ( )/3040=93.4% of credit a single family unit would get Middle unit ( )/3040=86.8% of credit a single family unit would get
6 WHATS NEW IN ASHRAE Multifamily Infiltration Credit
7 WHATS NEW IN ASHRAE Multifamily Infiltration Credit
8 Other requirements in ASHRAE Adjacent spaces statement in state plan that we will use blower door guided air sealing and infrared camera to ensure minimal air movement between conditioned space and garages, crawlspaces, attics, and other dwelling units
9 Other requirements in ASHRAE Instructions and Labeling Instructions and education will be provided to the client on any new systems installed. Labeling will be done as discussed earlier. 6.3 Clothes Dryers. Clothes dryers shall be exhausted directly to the outdoors
10 Other requirements in ASHRAE Combustion and Solid Fuel Appliances we have a variance from DOE because our Worst Case Spillage test covers this 6.5 Space Conditioning System Ducts ducts outside the living space must be sealed and tested. No more leakage than 6% of total fan flow is allowed. May ask for a variance on this as it will be hard to achieve in a lot of our housing stock
11 Other requirements in ASHRAE Minimum Filtration supply air from outside must be filtered by a MERV 6 filter or better 6.9 Carbon Monoxide Alarms must be installed to NFPA 720 and local codes
12 Other requirements in ASHRAE Remember if the required mechanical ventilation is 15 cfm or less, no additional ventilation needs to be installed
13 Other requirements in ASHRAE The use of existing fans is allowed. You may have to install a new control and the fan control must be labeled. I don t see this in the standard so I got an from DOE saying this is allowed. It would seem to allow kitchen range hoods to be used we will not do this. Possibly, if you started work and a client then says they do not want a fan installed.
14 Other requirements in ASHRAE
16 First we need good information to enter into the calculation how do we get existing fan flows? Exhaust Fan Flow Meter Averaging AirFlow Sensor Pitot tube
17 Blower Door method and chart
18 RED Depressurization Analysis calculator
19 Where do we really want to add ventilation? Visible signs of problems mold, stained walls and ceilings, pets, dirty carpets and furniture, evidence of water problems Odors musty, damp, chemicals, pets (and everything that comes with them), smokers Tight houses especially if they were leaky before weatherization Dwelling units that call for a high required ventilation rate
20 What if none of these problems exist and the standard is telling us we need a small amount of ventilation added? Remember the 15 cfm rule Take a look at the local ventilation. Would it be easier to just add a better bathroom fan or kitchen fan? Sone requirements do not have to be met when replacing existing local ventilation.
21 What if none of these problems exist and the standard is telling us we need a small amount of ventilation added? Normally we do not run the calculation more than once it is not a pre and post reading like a blower door The exception would be where the calculation was done upfront and the post blower door reading is lower than estimated. This will have a big effect on the required mechanical ventilation.
22 What if none of these problems exist and the standard is telling us we need a small amount of ventilation added? However, you can play with the calculation to see if there are some options that may lower the required mechanical ventilation. Try adding some better local exhaust Do not play with the blower door numbers you should always air seal everything you can.
23 Replacing a bathroom fan may lower the Alternative Compliance penalty
24 Replacing a kitchen range hood may also lower the Alternative Compliance penalty
25 Ok. We have to add ventilation. Where do we start? What do we take into consideration?
26 What type of ventilation should we add? Factors to take into consideration Climate? Dwelling type? How much do we need to add? Ease of installation? Are there natural draft appliances that may have issues? Is there available make up air?
27 What type of ventilation should we add? Exhaust most common in our program and in our climate Advantages Least expensive Experience has taught us easier ways to install Make up air gets some conditioning coming through the small cracks that we didn t air seal Running a building a little negative in cold climates doesn t present moisture damage issues
28 What type of ventilation should we add? Exhaust most common in our program and in our climate Disadvantages Have to be mindful of natural draft and power assisted draft appliances. It is not as big a problem as the original perception but it can be the tipping point on some systems especially natural draft water heaters. No way to address filtration of outside air. In some areas you may have to go long periods of time without using them.
29 What type of ventilation should we add? Supply hard to do in cold climates. Used mostly in southern states Where do you blow cold winter air into a house? Will pressurize the home could cause structural damage from moisture Example HVAC contractors like to run fresh air vents into the return ductwork we have seen significant damage from this practice
30 Lets try not to do this to any of our homes!
31 What type of ventilation should we add? Balanced the best when it can be done. More complicated and much more expensive Can have the same issues as supply with where to add the cold fresh air. If used with heating system ductwork it is hard to balance and requires complicated controls to meet the standard. Not many contractors have experience installing these.
32 What type of ventilation should we add? Balanced the best when it can be done. More complicated and much more expensive Sometimes may be the only option or the cheapest option example - having to replace other appliances In very tight homes make up air may have to be brought in for exhaust fans to work like they should. In this case it makes more sense to use heat recovery or energy recovery ventilators.
33 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? What type of construction? Home with basement that is conditioned or semiconditioned Home with conditioned crawlspace or semi- conditioned Home on slab Combinations
34 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? Where in the house is the worst air? Bathroom? Kitchen? Mostly moisture issues, some odor, gas ranges Should be covered by local ventilation Basement? Crawlspace? In our climate and housing stock, basements are the most common type of construction, some crawlspaces
35 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? Basements and Crawlspaces Moisture issues, storage (chemicals), furnaces and water heaters, radon In our program, basements and crawlspaces are the hardest to air seal so air leakage becomes a factor With crawlspaces you do have an option to condition them and seal them off from the rest of the house many times it is hard to do
36 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? The house needs to be set up so all levels communicate with each other the fan needs to be able to pull from all levels In my experience, many programs opt for installing the fans on the main floor or second floor. The preferred method seems to be replacing a bathroom fan with a low sone, dual function fan.
37 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? The house needs to be set up so all levels communicate with each other the fan needs to be able to pull from all levels In this case if the fan is installed on the main floor or above, it will pull air from the basement up into that part of the living space. Because of the air leakage in the basement it will dilute the pollutants down there, but air quality on the main floor (and above) will be negatively affected.
38 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? We have seen this in the past when installing fans in the main or even second floor bathrooms. Clients have called and complained of musty smells that were not present before. It stands to reason that if we are pulling musty air up from the basement, it is also carrying the other pollutants as well.
39 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? This is why it makes sense in a lot of our housing to install exhaust ventilation in the basement. Good results after a lot of units done Ease of installation open ceilings, short duct runs, wire in extension cord and label it
40 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? This is why it makes sense in a lot of our housing to install exhaust ventilation in the basement. While this is not radon mitigation, it stands to reason that if we are helping with other pollutants, radon concentrations will be less. We still must be careful not to run the space to negative.
41 So we have decided that exhaust ventilation is the best option for the dwelling unit. Some other types of exhaust ventilation used in basements Inline fans can be used with ductwork to provide some source point and whole house ventilation
42 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? Crawlspaces gets a little more difficult You can install the same kind of system Crawlspace must be insulated and sealed with ground cover. It must also communicate with the rest of the house. Inline fans can be a good option where basement and crawlspace combinations exist.
43 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? Slab on grade go with main floor or above Dual function bath or kitchen range hoods Centrally located Again, if house is really tight, exhaust fans may not work as well
44 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it? Manufactured Homes Options include through the wall fans, ceiling exhaust fans, dual function bath and kitchen range hoods Decide what is existing and use the easiest method
45 So we have decided that exhaust ventilation is the best option for the dwelling unit. How do we decide where to install it?
46 So we have decided that exhaust ventilation is the best option for the dwelling unit. A lot of options for exhaust ventilation Try to keep it simple It will be easier for you and easier for the client to understand Use a fan with cfm that meets the required mechanical ventilation as close as possible Fans that are out of sight don t get turned off as often
47 So what if balanced ventilation is the best option for the dwelling unit. A lot of options for balanced ventilation Heat recovery ventilator Energy recovery ventilator Smaller units with no heat recovery Adds supply (make up air) Some shut off the supply air under 30 degrees
48 So what if balanced ventilation is the best option for the dwelling unit. Remember that even though they are more energy efficient, the air brought in from outside will still be much colder than inside air. You have to find a way to buffer the colder air by mixing it with inside air. Best way we have found is to install it in a return preferably down line from the furnace. The returns for the unit can be used like the inline fan. Placement can be in the basement and used like source point local exhaust.
49 So what if balanced ventilation is the best option for the dwelling unit. The problem with using furnace ductwork is that by adding the fresh air to the return, it acts like a duct leak and can pressurize the house. Dampers need to be used to shut off the air when the furnace runs. This means it is hard to meet ASHRAE because it is depending on the furnace to tell it how long it runs.
50 So what if balanced ventilation is the best option for the dwelling unit. To get around this problem, special controls have to be installed to balance pressures when the furnace runs and when it is off. Very complicated and very expensive. Best if you can get by without using the ductwork. If you need to install balanced ventilation, I would recommend talking with us first.
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