VentMaster, Inc.



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We design and install attic ventilation systems for fit the needs of your home. We use a combination of leading edge techniques to give your house the best possible ventilation.



Call us at 781-643-7501
Please note that we will be happy to return all calls
Monday thru Friday from 9:00 AM - 5:00 PM.

Ventilation solutions include:

  • Ridge vents with external baffles
  • Improved soffit vents: replacement of solid vinyl soffits with highly efficient, perforated vinyl soffits
  • Insulation:
    • Blown-in insulation
    • Insulated covers for pull down attic stairways
  • Bathroom ventilation:
    • Fans vented properly!
    • Fan timers and improved air-flow techniques
  • Dryer duct work done right
  • Roofing/flashing - we fix ice dams-permanently!
Ridge Vents

Ridge vents are a type of fixed exhaust venting. Compared to other types of fixed venting, ridge vents offer several unique advantages:
Maximum efficiency. The best ridge vents use an external baffle designed to draw out hot attic air and attic moisture regardless of wind direction or force (see below).
baffled ridge vent - draws out hot and moist air

A baffled ridge vent creates an area of low
pressure on both sides of the ridge vent. It literally
pulls air out of the attic.
When wind direction is perpendicular to the ridge, it strikes the external baffle and jumps over the ridge. That movement creates a Bernoulli Effect, causing low pressure to develop on both sides of the vent. When that happens, air from the attic is “lifted” out, in much the same way low pressure created above an airplane wing gives “lift” to the plane.

The same thing happens when the wind direction is parallel to the ridge. It moves across the louvers, creating low pressure areas at the louvers on both sides of the ridge vent.

In addition, when little wind force exists, ridge vents take full advantage of the thermal effect to maintain sir circulation across the underside of the roof sheathing. Warm air rises to the ridge and exhausts through the vent. That allows a continuous flow of cooler air to enter through the intake vents. Only ridge vents use thermal effect efficiently and effectively because only ridge vents provide continuous and uniform air movements along the length of a roof.

ridge vent louvers
Fifteen roof louvers are required to equal the exhaust venting of 42 linear feet of ridge vent. This clearly demonstrates the performance and aesthetic advantages of ridge vents.

Maximum air movement
Externally baffled ridge vents work better because they take advantage of two natural forces: thermal effect or the fact that warm air rises, and low air pressure that is created at the vent openings as wind is deflected by the baffle.

Uniform Air Movement
Because ridge vents run the entire length of the roof, they provide a uniform flow of air along the underside of the roof sheathing. That air movement helps eliminate “hot spots” that can develop with other types of exhaust vents – even powered vents. No other exhaust vent provides this type of airflow pattern.

Maximum Visual Appeal
Most ridge vents offer a low-profile design that minimizes their appearance on a roof. Shingle-over designs allow optimum blending with other roof materials (see above).

It’s important to emphasize that these advantages apply only to ridge vents that use an external baffle design. A series of independent tests has concluded that only an external baffle can direct the wind up and over the cent. That is important because it is that controlled flow of air that created the area of low pressure that causes airo to be pulled from the attic (see below).
baffled ridge vent baffled ridge vent

A roll vent with an internal baffle, or withour any baffly at all, does not "pull" air from the attic.

An externally baffled vent "pulls" air from the attic from both sides of the ridge vent.

Soffit Vents (Intake Vents)  
Intake vents are available in many designs. In choosing the right type for a particular job, you have to consider the structure of the home, the area where the vents will be located and the net free area provided by each unit. The most common types of soffit (intake) venting are:


Undereave Vents are mounted under the soffit, on the underside of the eave of the house and allows needed air to enter the attic Units vary in size and the net free area varies accordingly.

Undereave vents

Continuous soffit vents take in outside air and are also mounted in the soffit, on the underside of the eave. These vents vary in length, with the typical length being 96”.

continuous soffit vent

Vented drip edge is used on homes without soffits, eave areas or gutters. Vented drip edge combines a drip edge with intake louvers. This vent should only be used if there are no gutters.

drip edge vent

The Edge™ Vent shingle-over intake is a roof-top installed vent and works well when there are no soffits or gutters.

While conventional intake vents require installation in the soffit for maximum weather protection, the shingle-over intake vents, The Edge Vent, has been designed for roof-top installation and maximum weather protection. This vents works well when there are no soffits or gutters.

Click here for a short video to see how the Edge Vent works.

The Edsge roof vent

Bathroom Ventilation  

One of the most important items in a bathroom is a properly installed ventilation fan. It is also one of the most affordable and least noticeable items. Underestimating the amount of damage simple water vapor can do is a major mistake for any homeowner.

Without proper ventilation, excess bathroom moisture can affect the indoor air quality and jeopardize the structure of your house.

Adequate bathroom ventilation, properly installed, is the best way to eliminate steam and bathroom odors. Mounted in the ceiling or in the wall, ventilation fans help rid the bathroom of odors and, most importantly, of potentially damaging moisture.

Why a VentMASTER installed bathroom ventilation solution?

  • The correct amount of ventilation for your space - We ensure your VentMASTER solution will move the right volume of air to ventilate your bathroom successfully.
  • Quiet fans - In order to be effective, a bathroom fan needs to be used and that usually won't happen if it's too noisy.

  • Fans vented properly! - An improperly vented fan can be disastrous, leading to moisture damage and serious mold issues.
  • Fan timers - A fan timer makes sure your system will run for the proper amount of time needed to clear the air of moisture while you go on your way!

  • Improved air-flow techniques - Proper airflow is required to ensure your bathroom ventilation removes the maximum moisture.

Bad Ventilation Installation
bad attic ventilation


Proper Ventilation Installation
good attic ventilation

What If I Have no Soffits?  
If your house does not have soffits or gutters, we can install ventilated drip edge for your soffit vent.
drip edge soffitt vent For applications without soffits, vented drip edge combines a drip edge with intake louvers. This vent should only be used if there are no gutters.
Also, if your house does not have soffits but there are gutters present, ventilated drip edge should not be installed because the gutter can fill with snow in the winter and block the drip edge making the vent useless. In this situation we recommend the installation of “Smart Vent” (see below).
The Edge roof vent While conventional intake vents require installation in the soffit for maximum weather protection, the shingle-over intake vents, The Edge Vent, has been designed for roof-top installation and maximum weather protection

Hip Rooves  

An Attic Ventilation Challenge

Hip roofs can be challenging for attic ventilation for two reasons. First, hip roofs often create a large volume of space in the attic that needs to be ventilated. Second, while ridge vents are the preferred method to ventilate an attic, the length of the ridge on many hip roofs isn’t long enough for a ridge vent to effectively ventilate the attic.

If you need to ventilate a hip roof, here are some solutions:

Ridge Vents: Contrary to what many people think, a ridge vent – installed across a ridge – may be a solution for ventilating a hip roof design if it is long enough tosatisfy ventilation requirements.

Power Attic Ventilators: a roof-mounted power attic ventilator may be the best option to ventilate a hip roof. A power attic ventilator, especially a model with a combination thermostat/humidistat, can quickly and efficiently ventilate the area when needed.

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American Society of Home Inspectors Indoor Air Quality Assoc. Lead Safe Certified Firm

References Available
Mass. Builders License # 040893
RI Builders Lic #37509
Mass. Home Improvement Contractors
Registration # 126385
VentMASTER - Arlington, MA
A division of Donald Marcoux Inc.

Tel: 781-643-7501
Fax: 781-641-4088

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