Mighty Venter Power Vent Systems
Page 3
SECTION 1.
General Information
WARNING
The MV2, MV3, MV4 or MV5 Mighty Venter must be
installed in accordance with the procedures outlined
in these instructions. Warranty applies only if the
installation and operating instructions applicable to
the model purchased are expressly and completely
followed.
The Laars Mighty Venter Models MV2, MV3,
MV4, MV5 are designed to side wall vent Laars’
Mighty Therm sizes 500 through 1825. All models are
supplied with a fan proving switch which will disable
the gas valve if the Mighty Venter fails to operate.
1a. Sizing
The Mighty Venter is sized for 500-1825 model
sizes as shown in Table 1. The vent pipe length shown
includes all vent pipe before and after the Mighty
Venter. To calculate the equivalent vent pipe length,
add the straight pipe plus 10 feet (3.0m) for every 90
degree elbow and 5 feet (1.5m) for every 45 degree
elbow.
1b. Installer Cautions
1.
Before beginning this installation, carefully read
these instructions and identify where each part is
placed in order to safely vent the flue gases to
the outdoors. This device must be installed and
maintained by a qualified professional installer in
accordance with these instructions. Failure to do
so may result in a hazardous condition such as an
explosion, carbon monoxide poison, bodily injury
and property damage. “Qualified Installer” shall
mean an individual properly trained and licensed.
2.
Consult local building and safety codes before
proceeding with work. The installation must
conform to the requirements of the authority
having jurisdiction or in the absence of such
requirements, to the latest edition of the National
Fuel Gas Code. ANSI Z223.1 or the CAN1-B149
installation Code (Canada), local plumbing and
waste water codes, Chimneys, Fireplaces, Vents
(NFPA #211), the National Electric Code (NFPA
#70) (or the Canadian Electrical Code CSA
C22.1) and the Occupational Safety and Health
Act (OSHA).
3.
Any modifications to the Power Venter, motor or
wiring may void the warranty. If field conditions
require such modifications, consult factory.
4.
The Mighty Venter may be used with the
following Laars hydronic boilers and volume
water heaters.
On/Off or Two Stage Firing Mode
Models: (HH, PH, VW, PW, IW, AP)
(500 through 1825)
5.
Carefully read the installation instructions
located in the Side Wall Vent Hood carton.
6.
The vent pipe necessary for this installation is
not provided by Laars. Purchase class “C” type
single wall vent pipe of diameter shown in the
sizing table (see Table 1). Choose a vent pipe
thickness (or gauge) that is in accordance with
requirements of the local authority having
jurisdiction.
7.
The Mighty Venter must be as close to the point
of termination (
ie,
wall) as possible. This will
ensure that the vent pipe between the boiler and
Mighty Venter is under negative pressure.
Table 1. Sizing.
Mighty
Venter
Model
Boiler/
Heater
Size
Mighty Venter
Order Number
Boiler/Heater
Outlet Diameter
in. (mm)
Vent Pipe
Diameter
in. (mm)
Maximum
Equivalent
Pipe Length
feet (m)
Mighty Venter
Diameter
in. (mm)
MV2
500
20069301
10 (254)
8 (203)
100 (30.5)
6 (152)
MV3
600
20069302
12 (305)
8 (203)
100 (30.5)
8 (203)
715
20069303
12 (305)
10 (254)
100 (30.5)
8 (203)
MV4
850
20069304
14 (356)
10 (254)
100 (30.5)
8 (203)
1010
20069305
16 (406)
12 (305)
100 (30.5)
8 (203)
MV5
1200
20069306
16 (406)
10 (254)
100 (30.5)
10 (254)
1430
20069307
18 (457)
10 (254)
100 (30.5)
10 (254)
1670
20069308
18 (457)
12 (305)
80 (24.4)
10 (254)
1825
20069309
18 (457)
14 (356)
100 (30.5)
10 (254)
NOTES:
To be used for single boiler/heater installation only. To calculate the equivalent vent pipe length, add the straight pipe plus 10 feet for every
90° elbow and 5 feet for every 45° elbow. Vent pipe reducers will be supplied by Laars. Vent pipe is field supplied. In order to use 100'
equivalent length of vent pipe with the size 1670 consult factory. A 14" vent pipe may be used.
