HomeMy WebLinkAboutFile Documents.1130 Black Birch Dr.0096.2018 (7).ARBKInstructions:
Floor Area (Afloor)# of Bedrooms (Nbr)Number of occupants Required Continuous Balanced
Outdoor Ventilation Rate (Qr)
9,691 sqft 7 8 118 cfm
Desired number of hours
operated each 4 hour period
Required Intermittent Balanced
Outdoor Ventilation Rate
1.33 hrs 353 cfm
OR
Desired intermittent
balanced outdoor
ventilation rate
Required number of hours operated
each 4 hour period
362 cfm 1.30 hrs
Qr = ((0.01 x Afloor) + [7.5 x (Nbr + 1)]) x Sc
Qr = ventilation flow rate, cubic feet per minute (cfm)
Afloor = floor area in square feet (ft2)
Nbr = number of bedrooms, not less than one
Sc = 0.75 (system coefficient for balanced systems)
4. If you wish to ventilate intermittently, enter the number of hours you want the system to run every 4 hour period to get the required intermittent balanced
ventilation rate; or, enter the desired outdoor ventilation rate to get the number of hours it will need to run every 4 hour period.
The City of Aspen has created and provided this software solely as a reference. Users should obtain assistance from a qualified
professional to verify accuracy and applicability before proceeding. The City of Aspen makes no express or implied warranty with
respect to this software or any information contained herein. To the full extent permissible by law, the City of Aspen disclaims all
responsibility for any damages or losses (including, without limitation, structural damage, building defects, financial loss,
damages for loss in business projects, loss of profits or other consequential losses) arising in contract, tort or otherwise from the
use of or inability to use this software, or from any action or decision taken as a result of using this software.
V3 modified 6/9/2017
2015 IMC as amended by Ordinance 40, 2016
City of Aspen Residential Ventilation Calculator
3. The required continuous balanced ventilation rate is displayed.
1. Enter the floor area in square feet of the residential unit in question.
2. Enter the number of bedrooms.