Durablow M1 User manual

DURABLOW ®CRAWL SPACE VENTILATOR MANUAL (M1, M1D, M2D, M2D-S430)
© 2018 (Version 20160813) Page
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READ OWNERS INSTRUCTIONS CAREFULLY BEFORE INSTALLATION.
PLEASE REMAIN THESE INSTRUCTIONS. DO NOT THROW AWAY.
DESCRIPTION
Our DURABLOW Crawl Space Ventilator Fan Kits are designed to enhance the circulation of outdoor air
underneath homes & corridors. In order to prevent the rotting of support columns, joists, floors & beam supports,
to lower the humidity level in Crawl Spaces is very necessary & important. In addition, humidity helps in fungus
growth, and attract termite nesting & breeding here which is harmful for wooden structure buildings / houses.
All Ventilator models are equipped with a built-in thermostat which prevents the fan operation if temperature is
below 35°F (approx. 0°C). Advanced models (M1D, M2D, M2D- S430) are equipped with a de-humidistat which
activates the ventilator fan when the relative humidity rises above the pre-set “trigger point %”.
SPECIFICATION
MODEL: M1
Air Flow : 110 CFM,
Rating : 120 Volts ~ 50/60 Hz,
0.30 Amps MAX.
Thermostat :
On at 50°F, Off at 35°F
Size : 14 3/8” x 6 7/8” x 2”
MODEL: M1D
Air Flow : 110 CFM,
Rating : 120 Volts ~ 50/60 Hz,
0.30 Amps MAX.
Thermostat :
On at 50°F, Off at 35°F
De-humidistat :
20% - 80% RH Range
Size : 18” x 9” x 2”
MODEL: M2D, & M2D-S430
Air Flow : 220 CFM
Rating : 120 Volts ~ 50/60 Hz
0.60 Amps MAX.
Thermostat:
On at 50°F, Off at 35°F
De-humidistat :
20% - 80% RH Range
Size : 18” x 9” x 2”
GENERAL INFORMATION
All DURABLOW Crawl Space Ventilators are passed factory functional & HIPOT (flashing test) tested.
Fan should operate smoothly. The wiring harness / assembly should be secured. If any damages on packing box
or item, notify the freight carrier or distributor immediately to file a damage claim / proof. Please email us if you
need any assistance. Email: [e-mail]
HOW TO CHOOSE YOUR CRAWL SPACE VENTILATOR
Calculate the cubical space of your crawl space with the formula LENGTH x WIDTH x HEIGHT (by feet). In order
to fully ventilate the air of the crawl space in 15 minutes (best effect in practices), divide the cubical space number
by 15 to get the minimum required air-flow CFM (models with higher CFM are always recommended).
EXAMPLE: 25’ x 30’ x 3.5’ of the crawl space = 2,625 cuft., then, divided by 15 = 175 CFM. So that, at least, two
M1 or M1D ventilators (110 x 2 > 175), or one M2D ventilator (220 > 175) are required.

DURABLOW ®CRAWL SPACE VENTILATOR MANUAL (M1, M1D, M2D, M2D-S430)
© 2018 (Version 20160813) Page
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The DURABLOW Crawl Space Ventilator must be installed by a qualified technician with this
instructions / manual. Improper installation can cause a hazardous danger such as fire, electric
shock or personal injury or death.
Please contact with DURABLOW ([e-mail]) if any questions in installation. Keep the power source
disconnected before & during the installation and maintenance.
CAUTION: For general home ventilation use ONLY. Not for industrial or exhausting hazardous gases use.
WARNING: To avoid the danger of fire or electric shock, do NOT use with any solid-state speed control device.
★4 EVA pads are included in box to reduce vibration and noise. Apply on 4 sides of front panel before mounting.
TOOLS & SKILLS
a. 5/16" Nut Runner or Flat Head Screw Driver.
b. Drill with 5/16" Masonry Bit if mounting on brick or foundation block.
c. Model M1 must be hard wired. Grounding Outlet within 6 feet of Ventilator location (M1D, M2D, M2D-S430).
INSTALLATION
LOCATION - Install this Ventilator from inside of the crawl space, behind existing foundation ventilation openings.
NOTE: To make sure pushing the air out of the Crawl Space, the ventilator must be installed with the
electrical control box and motor being seen from the inside of the crawl space. (see diagram below).
1. Remove the existing doors / covers on ventilation openings around the perimeter of the crawl space.
2. Position the Crawl Space Ventilator over the ventilation opening.
3. (a) If installing on foundation block or brick, mark location of mounting holes in the four corners of the metal
panel plate and drill 5/16" holes with masonry drill bit. Insert wall anchors into openings and secure Crawl Space
Ventilator to the wall with four screws. (b) If installing on a wood wall, rim joist or mesh panel on crawl space
vent openings, secure your ventilator with screws, washers and nuts in the four corners of the ventilator metal
panel plate.
INSTALLING MODEL M1
INSTALLING MODEL M1D, M2D, & M2D-S430
(it is model M2D shown below)

DURABLOW ®CRAWL SPACE VENTILATOR MANUAL (M1, M1D, M2D, M2D-S430)
© 2018 (Version 20160813) Page
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WIRING
(a) WIRING A SINGLE MODEL M1
(b) WIRING MULTIPLE MODEL M1
Identify the wires:
(N) Neutral wire
(G) Grounding / Earth wire
(L) Live wire

DURABLOW ®CRAWL SPACE VENTILATOR MANUAL (M1, M1D, M2D, M2D-S430)
© 2018 (Version 20160813) Page
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(c) MODEL M1D INTERNAL WIRING
(d) MODEL M2D, & M2D-S430 INTERNAL WIRING
WARRANTY & CUSTOMER SERVICE
WARRANTY
“DURABLOW LIMITED ONE YEAR WARRANTY”
M1, M1D, M2D: Real 304 Stainless Steel Housing & Panel, UL listed Fan, Thermostat, Dehumidistat, Power Cord.
M2D-S430: Real 304 Stainless Steel Housing & Panel, UL listed Fan, Thermostat, Dehumidistat, Power Cord.
DURABLOW warrants to the original purchaser of this product that the product will be free from the defects
of faulty materials or assembling for a period of ONE year from the date of original purchase.
Remedies under this warranty are limited to replacing or refunding, at DURABLOW’s options.
If DURABLOW requires the defects which are within the above stated warranty period, they should be returned
to DURABLOW appointed address, & return shipping prepaid by customers (return shipping will be refunded).
CUSTOMER SERVICE
(a) AMAZON and EBAY customers:
For better understanding the order & buyers’ details, please send email to the original seller from the original
marketplace platform. EXAMPLE: If you buy from eBay, please send email to the seller on eBay.
(b) Aliexpress, WISH.com, Newegg, Sears...other marketplaces’ customers:
Please send email to [e-mail] with your Buyer ID, Order ID, Product ID, Date of Purchase...etc.
for faster assistance.
www.PayandPack.com

DURABLOW ®CRAWL SPACE VENTILATOR MANUAL (M1, M1D, M2D, M2D-S430)
© 2018 (Version 20160813) Page
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Using Tips / Notice：
For crawl space ventilators (with dehumidistat) models: M1D, M2D, M2D-S430, MDT2P.
CRAWL SPACE VENTILATOR FUNCTION EXPLAINATION:
Example 1: Room humidity level 80%, outside humidity 65%, which means the lowest room
humidity level can reach is 65% (ideally). If you turn the knob on the ventilator fan to set 70%, the
blower is ON, and will be OFF when the room humidity goes down to 70% or lower.
Example 2: Room humidity level 80%, outside humidity 65%, which means the lowest room
humidity level can reach is 65% (ideally). If you turn the knob on the ventilator fan to set 50%, the
blower is ON, and will NOT be OFF because 50% can not be reached since this ventilator fan is not
a dehumidifier but a ventilation blower (pushing humid air out, and pulling dry air in).
Example 3: Room humidity level 80%, outside humidity 90%, which means the room humidity level
(in crawl space) is even lower than outside's. Therefore, the ventilator fan is not suitable for this
circumstance. (Please do NOT use ventilator fan, otherwise, room humidity will increase from 80%
to 90%). To lower the room humidity, you need a real DEHUMIDIFIER machine in the crawl space.
CONCLUSIONS:
1. Ventilator fan will run all the time if you set a very low humidity level which can never be reached.
2. Ventilator fan will stop running when room humidity equals or below the SET humidity.
3. Ventilator fan will be OFF if you set a high humidity level, due to point 2.
Hope this helps. Have a good day!
Any questions, please email to [email protected] or go to www.payandpack.com.
Regards.
Durablow® x PayandPack store