HomeMy WebLinkAbout150448 2015 Vent MakeupBurnsville Heating & Air Conditioning, Inc.
3451 W. Burnsville Pkwy, Suite 120, Burnsville, MN 55337
Phone 952‐894‐0005 – Fax 952‐894‐0925 – Web www.burnsvilleheating.com
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Ventilation, Makeup and Combustion Air Calculations
Submittal Form for New Dwellings
Site address 16628 Draft Horse Blvd Date 9/27/16
Contractor Burnsville Heating & Air Conditioning, Inc Completed By Alan Dobson
VENTILATION REQUIREMENTS
TABLE R403.5.2
NUMBER OF BEDROOMS
1 2 3 4 5 6 2
Conditioned space1 (in
sq. ft.)
Total/
Continuous
Total/
Continuous
Total/
Continuous
Total/
Continuous
Total/
Continuous
Total/
Continuous
1000‐1500 60/40 75/40 90/45 105/53 120/60 135/68
1501‐2000 70/40 85/43 100/50 115/58 130/65 145/73
2001‐2500 80/40 95/48 110/55 125/63 140/70 155/78
2501‐3000 90/40 105/53 120/60 135/68 150/75 165/83
3001‐3500 100/50 115/58 130/65 145/73 160/80 175/88
3501‐4000 110/55 125/63 140/70 155/78 170/85 185/93
4001‐4500 120/60 135/68 150/75 165/83 180/90 195/98
4501‐5000 130/65 145/73 160/80 175/88 190/95 205/103
5001‐5500 140/70 155/78 170/85 185/93 200/100 215/108
5501‐6000 2 150/75 165/83 180/90 195/98 210/105 225/113
1. Conditioned space includes the basement and conditioned crawl spaces.
2. If conditioned space exceeds 6000sp. Ft. or there are more than 6 bedrooms, use Equation R403.5.2
R403.5.2 Total Ventilation rate.
The mechanical ventilation system shall provide sufficient outdoor air to equal the total ventilation rate average
for each 1‐ hour period in accordance with Table R403.5.2, or Equation 403.5.2, based on the number of bedrooms
and square footage of conditioned space, including the basement and conditioned crawl spaces.
For the purposes of Table R403.5.2 and Section R403.5.3, the following applies”
a. Equation R403.5.2 Total ventilation rate:
Total ventilation rate (cfm) = (0.02 x square feet of conditioned space) + (15 x (number of bedrooms =1))
b. Equation R403.5.2.1 Continuous ventilation rate: Continuous ventilation rate (cfm) = Total ventilation
rate/2
Amount Total _________165_________
Amount Continuous _______85_________
TABLE 304.1
COMBUSTION AIR REQUIREMENTS FOR GAS‐FIRED
APPLIANCES WHEN THE COMBINED INPUT IS UP TO
AND INCLUDING 400,000 Btu/hr
TOTAL INPUT OF APPLIANCES1,
THOUSANDS OF Btu/hr
(kW)
REQUIRED FREE AREA OF AIR‐
SUPPLY OPENING OR DUCT,
SQUARE INCHES
(sq mm)
ACCEPTABLE APPROXIMATE
ROUND DUCT
EQUIVALENT DIAMETER2,
INCH (mm)
25 (8)
50 (15)
75 (23)
100 (30)
125 (37)
150 (45)
175 (53)
200 (60)
225 (68)
250 (75)
275 (83)
300 (90)
325 (98)
350 (105)
375 (113)
400 (120)
7 (4,500)
7 (4,500)
11 (7,000)
14 (9,000)
18 (12,000)
22 (14,000)
25 (16,000)
29 (19,000)
32 (21,000)
36 (23,000)
40 (26,000)
43 (28,000)
47 (30,000)
50 (32,000)
54 (35,000)
58 (37,000)
3 (75)
3 (75)
4 (100)
4 (100)
5 (125)
5 (125)
6 (150)
6 (150)
6 (150)
7 (175)
7 (175)
7 (175)
8 (200)
8 (200)
8 (200)
9 (225)
1. For total inputs falling between listed capacities, use next largest listed input.
2. If flexible duct is used, increase the duct diameter by one inch. *
*Flexible duct shall be stretched with minimal sags.
BTU Amount for Non‐direct vent appliances ____________________
IFGC Appendix E, Worksheet E‐1
Residential Combustion Air Calculation Method
(for Furnace, Boiler, and/or Water Heater in the Same Space)
Step 1: Complete vented combustion appliance information.
Furnace/Boiler:
___Draft Hood ___Fan Assisted ___Direct Vent Input
(Not fan assisted) & Power Vent ______Btu/hr
Water Heater:
___Draft Hood ___Fan Assisted ___Direct Vent Input:
(Not fan assisted) &Power Vent ______Btu/hr
Step 2: Calculate the volume of the Combustion Appliance Space (CAS) containing combustion appliances.
The CAS includes all spaces connected to one another
by code compliant openings. CAS volume: _________________ft3
Step 3: Determine Air Changes per Hours (ACH)1
Default ACH values have been incorporated into Table E‐1 for use with Method 4b (KAIR Method).
If the year of construction or ACH is not known, use method 4a (Standard Method).
Step 4: Determine Required Volume for Combustion Air.
4a. Standard Method
Total Btu/hr input of all combustion appliances Input:_____________ Btu/hr
(DO NOT COUNT DIRECT VENT APPLIANCES)
Use Standard Method column in Table E‐1 to find Total Required Volume (TRV) TRV:_____________ ft3
If CAS Volume (from Step 2) is greater than TRV then no outdoor openings are needed.
If CAS Volume (from Step 2) is less than TRV then go to STEP 5.
4b. Known Air Infiltration Rate (KAIR) Method
Total Btu/hr input of all fan‐assisted and power vent appliances Input:_____________ Btu/hr
(DO NOT COUNT DIRECT VENT APPLIANCES)
Use Fan‐Assisted Appliances column in Table E‐1 to find
Required Volume Fan Assisted (RVFA) RFVA:_____________ ft3
Total Btu/hr input of all non‐fan‐assisted appliances Input:_____________ Btu/hr
Use Non‐Fan‐Assisted Appliances column in Table E‐1 to find
Required Volume Non‐Fan‐Assisted (RVNFA) RVNFA:____________ ft3
Total Required Volume (TRV) = RVFA + RVNFA RV=_______________+______________=_______________ft3
If CAS Volume (from Step 2) is greater than TRV then no outdoor openings are needed.
If CAS Volume (from Step 2) is less than TRV then go to STEP 5.
Step 5: Calculate the ratio of available interior volume to the total required volume.
Ratio = CAS Volume (from Step 2) divided by TRV (from Step 4a or Step 4b) Ratio = / = =
Step 6: Calculate Reduction Factor (RF).
RF ‐ 1 minus Ratio RF = 1 ‐ = m
Step 7: Calculate single outdoor opening as if all combustion air is from outside.
Total Btu/hr input of all Combustion Appliances in the same CAS (EXCEPT DIRECT VENT) Input: _______________Btu/hr
Combustion Air Opening Area (CAOA):
Total Btu/hr divided by 3000 Btu/hr per in2 CAOA = /3000 Btu/hr per in2= in2
Step 8: Calculate Minimum CAOA.
Minimum CAOA = CAOA multiplied by RF Minimum CAOA = x = in2
Step 9: Calculate Combustion Air Opening Diameter (CAOD)
CAOD = 1.13 multiplied by the square root of Minimum CAOA CAOD = 1.13 √ Minimum CAOA =__________ in.
1 If desired, ACH can be determined using ASHRAE calculation or blower door test. Follow procedures in Section
G304.
IFGC Appendix E, Table E‐1
Residential Combustion air (Required Interior Volume Based on Input Rating of Appliance)
Input Rating
(Btu/hr)
Standard Method
(ft3)
Known Air Infiltration Rate (KAIR) Method (ft3)
Fan Assisted Non‐Fan‐Assisted
19941 to present
Pre‐1994
1994 to present
Pre‐1994
5,000 250 375 188 525 263
10,000 500 750 375 1,050 525
15,000 750 1,125 563 1,575 788
20,000 1,000 1,500 750 2,100 1,050
25,000 1,250 1,875 938 2,625 1,313
30,000 1,500 2,250 1,125 3,150 1,575
35,000 1,750 2,625 1,313 3,675 1,838
40,000 2,000 3,000 1,500 4,200 2,100
45,000 2,250 3,375 1,688 4,725 2,363
50,000 2,500 3,750 1,675 5,250 2,625
55,000 2,750 4,125 2,063 5,775 2,888
60,000 3,000 4,500 2,250 6,300 3,150
65,000 3,250 4,875 2,438 6,825 3,413
70,000 3,500 5,250 2,625 7,350 3,675
75,000 3,750 5,625 2,813 7,875 3,938
80,000 4,000 6,000 3,000 8,400 4,200
85,000 4,250 6,375 3,188 8,925 4,463
90,000 4,500 6,750 3,375 9,450 4,725
95,000 4,750 7,125 3,563 9,975 4,988
100,000 5,000 7,500 3,750 10,500 5,250
105,000 5,250 7,875 3,938 11,025 5,513
110,000 5,500 8,250 4,125 11,550 5,775
115,000 5,750 8,625 4,313 12,075 6,038
120,000 6,000 9,000 4,500 12,600 6,300
125,000 6,250 9,375 4,688 13,125 6,563
130,000 6,500 9,750 4,875 13,650 6,825
135,000 6,750 10,125 5,063 14,175 7,088
140,000 7,000 10,500 5,250 14,700 7,350
145,000 7,250 10,875 5,438 15,225 7,613
150,000 7,500 11,250 5,625 15,750 7,875
155,000 7,750 11,625 5,813 16,275 8,138
160,000 8,000 12,000 6,000 16,800 8,400
165,000 8,250 12,375 6,188 17,325 8,663
170,000 8,500 12,750 6,375 17,850 8,925
175,000 8,750 13,125 6,563 18,375 9,188
180,000 9,000 13,500 6,750 18,900 9,450
185,000 9,250 13,875 6,938 19,425 9,713
190,000 9,500 14,250 7,125 19,950 9,975
195,000 9,750 14,625 7,313 20,475 10,238
200,000 10,000 15,000 7,500 21,000 10,500
205,000 10,250 15,375 7,688 22,525 10,783
210,000 10,500 15,750 7,875 22,050 11,025
215,000 10,750 16,125 8,063 22,575 11,288
220,000 11,000 16,500 8,250 23,100 11,550
225,000 11,250 16,875 8,438 23,625 11,813
230,000 11,500 17,250 8,625 24,150 12,075
1 The 1994 date refers to dwellings constructed under the 1994 Minnesota Energy Code. The default KAIR used in this section of the table is 0.20 ACH.
2 This section of the table is to be used for dwellings constructed prior to 1994. The default KAIR used in this section of the table is 0.40 ACH.
Table 501.4.1
Procedure to Determine Makeup Air Quantity for Exhaust Appliances in Dwelling Units
ONE OR MULTIPLE
POWER VENT OR
DIRECT VENT
APPLIANCES OR NO
COMBUSTION
APPLIANCESA
ONE OR MULTIPLE
FAN‐ASSISTED
APPLIANCES AND
POWER VENT OR
DIRECT VENT
APPLIANCESB
ONE
ATMOSPHERICALLY
VENTED GAS OR OIL
APPLIANCE OR ONE
SOLID FUEL
APPLIANCEC
MULTIPLE
APPLIANCES THAT
ARE
ATMOSPHERICALLY
VENTED GAS OR OIL
APPLIANCES OR SOLID
FUEL APPLIANCESD
1. Use Appropriate Column to Estimate House Infiltration
a) pressure factor
(cfm/sf)
0.15
0.09
0.06
0.03
b) conditioned floor
area (sf)
4054
(including unfinished basements)
Estimated House
Infiltration (cfm):
[1ax 1b]
608.1
2. Exhaust Capacity
a) Clothes dryer 135 135 135 135
b) 80% of largest
exhaust
rating (cfm)
240
(not applicable if recirculating system or if powered makeup air is electrically interlocked and matched to exhaust
c) 80% of next
largest
exhaust rating
(cfm):
64
(not applicable if recirculating system or if powered makeup air is electrically interlocked and matched to exhaust
Total Exhaust Capacity
(cfm):
[2a+2b+2c]
439
3. Makeup Air Requirement
547) Total Exhaust
Capacity
(from above)
439
b) Estimated House
Infiltration
(from above)
608.1
Makeup Air
Quality (cfm):
[3a‐3b]
‐169.1
(if value is negative, no makeup air is needed
4. For Makeup Air opening Sizing, refer to Table 501.4.2
A. Use this column if there are other than fan‐assisted or atmospherically venter gas or oil appliances or if there are no combustion appliances.
B. Use this column if there is one fan‐assisted appliance per venting system. Other atmospherically vented appliances may also be included.
C. Use this column if there is one atmospherically vented (other than fan‐assisted) gas or oil appliance per venting system or one solid fuel appliance.
D. Use this column if there are multiple atmospherically vented gas or oil appliances using a common vent or if there are atmospherically vented gas or oil
Table 501.4.2
Makeup Air Opening Sizing Table for New and Existing Dwelling Units
TYPE OF OPENING
OR SYSTEM
ONE OR MULTIPLE
POWER VENT OR
DIRECT VENT
APPLIANCES OR NO
COMBUSTION
APPLIANCESA
ONE OR MULTIPLE
FAN‐ASSISTED
APPLIANCES AND
POWER VENT OR
DIRECT VENT
APPLIANCESB
ONE
ATMOSPHERICALLY
VENTED GAS OR OIL
APPLIANES OR ONE
SOLID FUEL
APPLIANCEC
MULTIPLE
APPLIANCES THAT
ARE
ATMOSPHERICALLY
VENTED GAS OR OIL
APPLIANCES OR
SOLID FUEL
APPLIANCESD
PASSIVE MAKEUP
AIR OPENING DUCT
DIAMETERE,F,G
(cfm) (cfm)(cfm)(cfm) (inches)
Passive opening 1 – 36 1 –22 1 –15 1 –9 3
Passive opening 37 – 66 23 –41 16 –28 10 –17 4
Passive opening 67 – 109 42 –66 29 –46 18 –28 5
Passive opening 110 ‐ 163 67 –100 47 –69 29 –42 6
Passive opening 164 – 232 101 –143 70 –99 43 –61 7
Passive opening 233 – 317 144 –195 100 –135 62 –83 8
Passive opening
w/motorized
damper
318 – 419 196 – 258 136 – 179 84 – 110 9
Passive opening
w/motorized
damper
420 – 539 259 – 332 180 – 230 111 – 142 10
Passive opening
w/motorized
damper
540 – 679 333 – 419 231 – 290 143 – 179 11
Powered
makeup airH
>679 >419 >290 >179 NA
A. Use this column if there are other than fan‐assisted or atmospherically vented gas or oil appliances or if there are no combustion appliances.
B. Use this column if there is one fan‐assisted appliance per venting system. Other than atmospherically vented appliances may also be included.
C. Use this column if there is on atmospherically vented (other than fan‐assisted) gas or oil appliance per venting system or one solid fuel appliance.
D. Use this column if there is multiple atmospherically vented gas or oil appliances using a common vent or I there are atmospherically vented gas or oil appliances
and solid fuel appliances.
E. An equivalent length of 100 feet of round smooth metal duct is assumed. Subtract 40 feet for the exterior hood and ten feet for each 90‐degree elbow to
determine the remaining length of straight duct allowable.
F. If flexible duct is used, increase the duct diameter b one inch. Flexible duct shall be stretched with minimal sags.
G. Barometric dampers are prohibited in passive makeup air openings when any atmospherically vented appliance is installed.
H. Powered makeup air shall be electrically interlocked with the largest exhaust system.