Attic Exhaust Fans

Winter months take a toll on your roof. If your roof is not in shipshape condition, it can put you to a lot of time waste and expense on account of significant damage that needs to be urgently remedied. It is therefore, advisable that you take steps necessary to ‘tone up’ your roof condition while the weather is good for making roof repairs before the arrival of winter. It is rightly said, ‘A stitch in time saves nine’.
A leaking roof is one of the biggest problems. The most common sources of leaks can be cracks and damage to the flashing around vents and chimneys. Other potential reasons can be missing and worn out shingles or condensation as a result of inadequate ventilation in the attic.
A pointer that your roof system needs a leak repair is the presence of ceiling spots. Visual inspection from a vantagepoint allowing you to externally check your roof can reveal missing or cracked damaged shingles. These should be replaced at once to avoid structural damage to the roof deck and the home interior. If a crack in the flashing is diagnosed, the flashing needs to be replaced or can be repaired if the damage is small.
If shingles appear curled or buckled, the problem is probably on account of aged shingles or damage to the felt underlayment under the shingles. Underlayment is a weather protection layer in the roof and its damage can lead to accumulation of moisture; the ultimate enemy of all roofing systems. Underlayment is now available in self-adhering rolls that are applied directly on the roof deck or can be laid as a layer on top of the existing underlayment. Damaged shingles should be replaced and underlayment though costly must be replaced, must be changed, if required. If shingles appear blistered, it is usually because they were applied on a wet deck or due to inadequate roofing ventilation. Proper roof ventilation allows natural flow of hot air upward out of the attic and keeps the attic cool and dry.
In winter, the prime cause for concern is the moisture build up in the attic. Despite the vapor barrier in the floor of the attic, unwanted moisture seeps into the attic with the air leaking through ceiling light fixtures, access panels, fold down attic stairways, bathroom exhaust fans etc. The cold outside of the roof makes moisture condense on the framing members and inside the roof deck and supports growth of mold, mildew and rot. This seriously affects roof deck strength and longevity. Inadequate attic ventilation can also make ice dams form on the shingles. Water accumulation behind icedams can seep into the attic/house through the shingles. It is therefore absolutely essential to ensure proper attic ventilation.
If there is inadequate attic ventilation, you may get a ridge vent (if your roofing system does not have one) installed to improve ventilation. Alternatively, a gable vent in the sidewall of the attic can be installed depending on the construction of your roofing system.
Another solution is to have a powered ventilator installed. Improved ventilation will prevent moisture condensation that can severely damage the roof.
If you face roofing problems it is best to secure the services of a qualified roofing contractor for fixing things up. Roofing work is expensive but it will be worth the expenditure in the long run, and to make sure your roof survive the winter.

Tenderall Fan Co. enginners truly reversible (exhaust and supply roof fan for general ventilating.

The Type CBRE recirculators are designed for use in commercial and industrial applications  where there is sufiicient ceiling height to create a temperature differential between the floor and the ceiling. These applications include factories, warehouses and large commercial buildings.

CBRE Roof Recirculators function as regular power roof ventilators in warmer weather and as an energy-saving recirculation air system in cold weather.  Each unit is equipped with a reversible fan that distributes warm ceiling air thoughout the plant and reduces the builing’s heating requirements. With a flip of a switch it can function as a conventional roof ventilator. There are two unit types: 1) for exhaust and recirculation; 2) for exhaust, supply and recirculation.

Available fan wheel sizes are from 24″ to 60″, performances: up to 50,000 CFM @ 1/2″ WG.

The reversible propeller incorporates specifically engineered airfoil sections and hub size for optimal efficiency and physical strength. Alternate adjustable pitch propeller blades are turned 180 degrees to one another and a double orifice is attached to the fan panel.

Type HS PRVs reliably extract large volumes of hot gases and smoke regardless of building configuration, location and weather conditions. They withstand high temperatures for long periods of time.

Another reliable ventilation system that can operate during a fire is Tenderall Fan Type HS Heat and Smoke Roof Ventilator. It prevents smoke logging, allows people to escape quickly, minimizes damages to property and contents and enables firemen to attack the fire without hindrance. These power roof ventilators have the added advantage of providing normal day to day ventilation and in many cases can also be fitted with duct work for use in multi storey buildings.

The concept of venting smoke and heat was first outlined by Industrial Risk Insurers (IRI). Use of powered ventilation could eliminate the problems experienced with gravity vents. Specially designed roof mounted exhaust fans would mechanically vent heat and smoke under emergency fire conditions.

The unique Type HS power roof ventilators provide a solution for emergency heat and smoke venting that is dependable under the most extreme circumstances.

All critical components of HS PTV that exposed to the airstream are ferrous construction to withstand high temperature conditions. These heavy gauge materials prevent warping of fan parts and malfunction at high temperatures. This also insures years of trouble-free service in normal daily operation of the PRV.

Belt and bearings are protected from the air stream by enclosing them in a ventilated tube. Design of HS fan incorporates a heat slinger/impeller. It isolates the fan bearings from damaging heat and draws cooler outside air through the motor compartment and over the belt and bearings. A spring loade, fusible link activated device automatically opens dampers when temperature at the fan reaches 165 F. Thei enables the fan to function as a gravity ventilator prior to powered operation.

Type HC Power Roof Ventilators have been tested to operate:

- conituously at 650 F;
- 3 Hours at 800 F;
- 1.5 Hours at 1000 F;
- 1/2 Hour at 1,200 F.

Additional information can be found at the Canada Blower company web site http://www.tenderall.com/ventilator/index.html.

Oleg Chetchel
Industrial Process Designer
Tenderall Fan Co.
http://www.tenderall.com/contact/index.html
http://www.tenderall.com/index.html

Ventilation plays a vital role in our everyday lives. Proper ventilated homes are healthier and comfortable homes. Roof of the house and its ventilation should be considered very seriously so as to save money, and live healthier. Vents allow hot attic air to vent out properly to save the roof from premature failure of asphalt roof shingles. Heat accumulated promotes moisture builds up and the growth of mold and mildew. Roof should be well ventilated to prevent and prolong roof life and lower energy cost. Fresh air should be crossed in homes to save everyone in the home from suffocation. There are many types of roof vents available these days and are widely used according to the different needs of the homes.

Roof Ridge Vents

Roof ridge vents as the name make it simpler to understand are the vents which are installed at the peak points of the roofs. These do help and allow the hot accumulative air to rise and escape out through the top of the roof. These roof ridge vents can be installed on the new roof or can be added to the present roof of the home. Thus it allows the sheathing cool and increases life for asphalt shingles.

Turbine Vents

Turbine vents are the one which are dome shaped and are so designed to catch the wind and spin the vent to pull hot air out of the attic. In this case wind provides free power to turn the turbine and vent the roof, but without wind these provide very little ventilation and are not allowed in few areas, especially those areas which are hurricane prone. In turbine vents one has to be very careful as to cover the turbine vents in the winter months and they may allow rain to enter the attic.

Pot Vents

The pot vents are vents mount over a hole in the roof and resemble an up side down pot. These types of vents do not actually need any energy to operate them. These kinds are useful on roofs which have a very little roof ridge for a roof ridge vent.

Solar Powered Vents

Solar power vents as the name tells run through a solar powered motor. They also resemble pot vents. Solar operated motor turns the fan and vents hot air from the attic. They actually help air flow to vent heat on calm days when air flow through the attic is negligible.

Soffit Vents

Soffit vents are one among the best vents ever made for roof ventilation; they are fitted on the soffit of the roof and acts as inlets and outlets of air making them one of the best choices for room ventilation. They can be installed as small vents spaced the length of the soffit or as one continuous vent. They should be used with a baffle to thwart them from directing air into the insulation and demeaning it effectiveness.

Power Ventilators

Power ventilators are mounted in the gable vents and are used as electric fans to pull air from the attic. Although they are quite common in older homes, they do cause more problems than they are worth of. Power ventilators produce a negative pressure inside the attic, afterwards cause heat or air from inside the house to escape through ceiling leaks. They can also pull mold and mildew spores, radon gas and even manure gases in to the house.

I refuse to say when & where I took this video out of respect for my friends on the companies involved. However, you may be able to figure it out based on radio traffic alone. Needless to say, if you are going to do roof vent work, come prepared. -word to the wise-

www.pushpameng.com / Email:- amit99980@gmail.com …. are Manufacturer, Products, Exporters, Wholesalers, Supplier, Providers, Manufacturing Company/Firm in INDIA, GUJARAT, AHMEDABAD of Roof Ventilators, Roof Ventilation, roof ventilation fan, roof ventilation, roof ventilation systems, roof…
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www.pushpameng.com / Email:- amit99980@gmail.com …. are Manufacturer, Products, Exporters, Wholesalers, Supplier, Providers, Manufacturing Company/Firm in INDIA, GUJARAT, AHMEDABAD of Roof Ventilators, Roof Ventilation, roof ventilation fan, roof ventilation, roof ventilation systems, roof…
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Ventilation plays a vital role in our everyday lives so it is vital to have good ceiling vent covers. Proper ventilated homes are in excellent health and comfortable homes. Having the proper roof ventilation is essential to save money and live in excellent health. A vent will allow the hot air in attics to vent out to save a roof from obstruction of roof shingles. If too much heat accumulates moisture will build up and promote the growth of mold. The roof should be well ventilated to prolong the roof life and lower energy cost. There are several types of roof vents avaialbe today, each of which will provide uses for different types of needs.

Roof Ridge Vents

Roof ridge vents are the vents which are installed at the peak points of the roof. At this location they help hot air rise and escape out of the top of the roof. You can install roof ridge vents on either new or old roofs. Thus it allows the house to be cooler and increases the lifespan of blacktop shingles.

Turbine Vents

The next type of ceiling vent color is the turbine. Turbine vents use a dome shape to catch wind and spin the vent in order to pull hot air out. With wind, free power is provided to turn the turbine and ventilate the roof, but without wind little ventilation is produced. If you are using turbine vents, you have to remember to cover the turbine vents in the winter or rainy months so they don’t allow rain to enter the attic.

Pot Vents

Pot vents are usually mounted over a hole in the roof and look like an upside down pot. Unlike turbine vents, these do not require wind to operate. These vents are more useful on roofs that have a small ridge for a vent..

Solar Powered Vents

Solar power vents as the name tells run using a solar powered motor. They also resemble pot vents. A solar operated motor turns the fan and vents hot air from the attic.

Soffit Vents

A sofit vent is one of the better vent made for ventilation; they are fitted on the soffit of the roof and acts as inlets and outlets of air making them one of the best choices for room ventilation. They can be installed as small vents spaced the length of the soffit or as one unremitting vent. They should be used with a baffle to stop them from directing air into the filling and decreasing its effectiveness.

Power Ventilators

Another type of ceiling vent is a power ventilator which is mounted in gable vents and used electronically. These used to be popular in older homes, but in general do more harm than good. Negative pressure is produced inside an attic and then causes heat from the house to escape through the ceiling. They can also pull mold and mildew spores, radon gas, and even manure gases into the house.

There are many different types of ceiling vent covers you can use to properly distribute air flow through your home. Doing so can result in a healthier life for you.

Drill on venting a roof at an acquired structure

Teams from the San Jose Fire Department practice their techniques on an old apartment building, May 2009. Here the Truck 13 crew is Venting the roof Crews from Ladder Truck 13, Light Unit 13, Fire Engine 12, Brush Patrol 12, Fire Engine 18, Med 30, Fire Engine 28, Brush Patrol 28 and Battalion Chief 13 were all on hand for the exercise. See all the photos from this drill at the YourFireDepartment.org site
Video Rating: 4 / 5

Roof Ventilation
Video Rating: 3 / 5