Heat Recovery Ventilation - NTI Matrix Installation And Operation Instructions Manual

Installation and Operation Instructions

15.0 HEAT RECOVERY VENTILATION

Ventilation Requirements
With the evolution toward more energy efficient, tighter homes, air quality problems have increased. With less
natural ventilation, pollutants such as pet dander, humidity, tobacco smoke and wood ash now become trapped
inside the home. Mechanical ventilation is the process of exhausting the polluted air from the space and replacing
it with fresh air from outside. The amount of ventilation required varies from home to home and can be estimated
using one of two methods, "Room Count Calculation Method" or "Air Changes per Hour Method"; see below:
Table 15-1 Room Count Calculation Method
Number of
Living Space
Rooms
Master Bedroom
With Basement
Without Basement
Single Bedroom
Living Room
Dining Room
Family Room
Recreational Room
Other
Kitchen
Bathroom
Laundry Room
Utility Room
Total Ventilation Requirement (sum last column)
Air Change per Hour Method:
Total cu.ft x 0.3 / 60 = Total Ventilation Required
A 25' x 40' house with basement
Example:
1000 sqft x 8' high x 2(main floor and basement) = 16,000 cu.ft
16,000 x .3 air changes per hour = 4,800 cu.ft/hr
4,800 cu.ft/hr / 60 = 80 cfm
80 cfm is ventilation requirement
50
CFM (L/S)
x 20 cfm (10 L/s) =
x 20 cfm (10 L/s) =
x 10 cfm (5 L/s) =
x 10 cfm (5 L/s) =
x 10 cfm (5 L/s) =
x 10 cfm (5 L/s) =
x 10 cfm (5 L/s) =
x 10 cfm (5 L/s) =
x 10 cfm (5 L/s) =
x 10 cfm (5 L/s) =
x 10 cfm (5 L/s) =
=
CFM Req'd
Matrix