International Revolving Door Company  ·  TEL: 1-812-425-3311
2138 North Sixth Avenue,  Evansville, IN. 47710 USA  ·


International Revolving Doors
- Frequently Asked Questions -

First though, a few terms and definitions. The terms below are common to the industry:

The entire door is termed as - one revolving door.

A "wing" is each one of the revolving door sections separating the multiple compartments.  For example, a 3-wing design has three revolving compartments; and a 4-wing design (the most common) has four compartments.  The wings usually attach to a "center shaft".

The arced sides surrounding the wings and compartments are called the "walls".  There are usually two walls, allowing for an "interior" opening side and an "exterior" side.

Above, is the "canopy", or "cornice".  Its top is the "roof".  Its bottom, visible to your customers when inside the door, is the "ceiling".

Please see the illustration to the left for the names of other principle components.

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• IRD's - Top Ten Reasons to Buy a Revolving Door! •

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Door Types
& Options

Below are common questions about revolving doors
that have been asked by customers and prospects.
Some of these may be the same questions you have.


Q.  How do we plan for a new revolving door?  What are the options available?

A.  Our team will work with you to plan your entrance, along with the door's metal(s), glass, and color scheme that will best compliment your building's decor.  Contact us today!  We want you to look at our entire line of manual, automatic, and automatic-security doors (or even hardwood door models) to determine which door type will best suit your needs.

Q.  Is there a specific size that we will need to adjust our building's entrance to meet, based on your door's size?

A.  Our doors are custom built!  We can design your door to virtually any width and height that your building requires.  Look at some of our past doors.  IRD has decades of experience with all sizes of doors, from a minimum inside door diameter of 6'6" all the way up to 16'0" or even larger.  Heights can range from 7'0" up to 12'0" or even higher - if this would meet with the most appropriate look to enhance your building's aesthetics.  IRD has 4 custom door designs.
Saturn Design is a good, standard-sized revolving door, suitable for most purposes.
Comet Design (same sizes as for Saturn) uses "all-glass" wings, to match glass entrances.
Titan Design is larger and roomier, encompassing up to an 11'0" inside diameter.
Jupiter Design, our largest; easily allowing for luggage or hand trucks to pass through.

Q.  Why are doors from International Revolving Doors inherently superior to the competition?

A.  Every door that we build has either a manual or electronic speed controller.  No more of the "out-of-control" spinning that our competitors can leave you with.  Our welds and braces are hidden from view.  And our wings are adjusted to be snug, not loose; yet in an emergency the wings will collapse ("wing break") to the side for wide-open traffic exiting.  This is pre-set in the factory to 120-140 pounds of pressure, unless your needs require a different setting.  (For example, a pressurized sports dome or underground mine entrance using revolving doors may need a higher setting.)

Q. How does a revolving door prevent drafts and reduce heating & cooling costs? 

A. Because at least two wings of a revolving door always contact the circle enclosure wall - a revolving door is always closed, yet always open too.  A draft cannot be created through a revolving door entrance.  With each person going through a revolving door only about 26 cubic feet of air is admitted. 

Q. Does a revolving door force cold air in and warm air out?

A. No. A minimum of air enters or leaves with each passage.  It is not possible for the door to pump the air in or out even during times when the door rotates continuously. 

Q.  How much energy savings can we expect by installing a revolving door?

A.  "Always open, always closed." (See above.)  Drafts are virtually eliminated as folks enter and exit on demand through your revolving door.  As long as the weather-stripping remains properly adjusted, you will notice a measurable lowering of your energy costs by using a revolving door.  And persons standing or seated near the entrance will no longer be subject to direct outside noises or sudden bursts of cold Winter or hot Summer air forcing its way into your controlled building environment.

Q.  Will a revolving door handle our volume and kind of trafic?

A. One manual revolving door can handle up a maximum of 2400 people in and 2400 people out in one hour.  If your peak traffic is heavier than this, you may need two or more doors at your entrance.  The Speed Control assures maximum entrance efficiency and traffic load;  it also prevents revolving doors from spinning or turning faster than the speed you establish.  There is actually less danger of injury with a revolving door than with swing doors because the flow and direction of traffic is regulated - crowd  "pushing" tactics are eliminated.

2400 persons each-way per hour is an average speed;
but it can vary considerably.  For example, office
workers who use a revolving door everyday going
into work will usually go faster than shoppers or
hotel guests.  There are also regional differences.
Pedestrian traffic in the North and East is
generally faster than it is in the West and South.

Q.  Are automatic and security doors able to handle the same high volume of pedestrians per hour as manual doors (per above)?

A.  Generally speaking, no.  Automatic and automatic-security doors get preset to run at a slower, more controllable number of revolutions per minute.  Additionally, IRD puts "anti-tailgating" and "anti-piggybacking" sensors along with "anti-collision" sensors above pedestrians in case a person either stops or pushes forward in the compartment.  These are important safety features.  Our representative will be glad to explain these features in detail.

Q.  We periodically need a large entrance opening through which to move displays and large articles. Will a revolving door let us do this?

A.  You can have large openings with revolving doors. The wings of revolving doors can be specially built (OHRA Model) to fold and roll aside to give as much or more clear opening as swing doors of comparable width.

Your Building Needs a Revolving Door!

Q.  We have an existing revolving door that needs refurbishing, can IRD help?

A.  IRD's restoration and retrofitting services will restore your door to its former lustre and to peak operational efficiency!

Q.  Do we also need swing doors for the entrance?

A.  Revolving Doors should be planned to handle your normal traffic.  Swing doors are often added on the side(s) to handle unusual overflow traffic and to meet emergency exit requirements.

Q.  How can hand trucks, large suitcases, or baby carriage traffic be handled through a revolving door?

A.  Under normal operation, rolling objects like large suitcases, hand stucks or strollers will not conveniently pass through a smaller (standard Saturn sized) revolving door.  Many building owners plan an auxiliary swing door alongside their revolving doors for atypical traffic such as this.  All of the regular pedestrian traffic flows through the revolving doors, with all the advantages a revolving door affords.  Alternatively, it is possible to order larger Automatic Doors that can handle such larger pedestrian traffic with ease - like our Titan and Jupiter Models.

Q.  How much interior floor space does a revolving door require?

A.  A revolving door will actually give you more usable floor space. When you consider the space required for a swing door to open, the area required for a revolving door is less. You gain additional flour space with revolving doors because you can use the area right up to the doors without discomfort or inconvenience for your tenants, their customers and clerks.

Q.  How close can a revolving door safely be located from a step?

A.  Generally, if the step is down, at least 18 inches; if the step is up, three feet or more is recommended.  But check your local building codes for exact measurements.

Q.  Do all building codes require swing doors to be alongside revolving doors?

A. This is a matter of local building codes. Check the code in your city, county, state or province for this information.

Q.  Can ceiling air duct grills or vents be added to a revolving door entrance's ceiling to heat or cool the air that comes in?

A . Certainly. This can be built-in to your door's design.  On new doors, this should be included in your plan's specifications as a part of the door itself.

Q.  Will revolving doors harmonize with modern building design?

A.  Many of America's main building entrances are being planned around revolving doors because of their many advantages and their smartness of appearance. They're an invitation to come in and do business.

Q.  Why won't a vestibule space between interior and exterior swing doors prevent drafts?

A.  If traffic is light enough so one of the sets of doors remains closed, a swing door vestibule will prevent drafts. However, when both sets of doors are held open at the same time - as is the case when traffic is heavy - there will be no barrier against drafts.

Q.  Are revolving doors sufficiently trouble-free that adjacent swing doors are unnecessary?

A.  Hundreds of installations of International Revolving Doors in the country's largest buildings have proved that revolving doors - without adjacent swing doors - are dependable in operation.  The reason for this is that a revolving door, being perfectly balanced, does not have to resist the extreme pressure and leverage of swing doors. Therefore, there is a minimum of wear and maintenance. Case histories show heavy traffic revolving door entrances in many large buildings operating continuously for 10 years without any undue maintenance whatsoever.

Q.  Why do many commercial buildings use swing door entrances?

A.  Many do to cut costs in order to meet initial construction budget limitations.  But later, the building owner or manager may want to add revolving doors. More will be installed as building owners learn the advantages of revolving doors better. Statistically, more than half of the revolving doors installed are replacements for previously installed swing doors.

Q.  Can you lock revolving doors securely? What about a building's automatic alarm system? Can an alarm system be put on the door?

A.  Yes in all cases.  Revolving door cylinder locks are - comparable to locks on other types of doors.  The alarm, as required, should be included in the original specfications to operate in conjunction with the accepted revolving door locking device.  This is true for both Manual and Automatic doors.  Additionally, IRD manufactures advanced Security doors that meet the needs of business and government entities.

Q.  My floor slopes outward. Can a revolving door be set on the sloping floor?

A.  This is not recommended.  If the angle or decination for storm run-off is even one-half inch over the width of the diameter of the door the weatherstripping will not seal properly. If possible, the floor should be made absolutely level underneath before the installation of a revolving door.

Q.  Are all new revolving doors designed without visible welds or braces between the doors?

A.  IRD's modern door designs limit or even entirely eliminate visible welds, screws, and supports.  Not all revolving door manufacturers are as conscientious of a door's aesthetics as IRD has been for many decades now.  Since 1931, among the many improvements incorporated in revolving doors was the braceless door which eliminates bars or cables. This design gives architects freedom to use narrow stiles and rails - or even the all-glass wings Comet Model.

Q.  Are revolving doors safe to operate?  How about in an emergency?

A.  A manual revolving door made by IRD has a manual speed control either above or below the center shaft.  This will keep it from speeding up or spinning unsafely.  Our automatic and security doors have electronically-regulated speed controls (usually above) with built-in sensors on the wings that monitor the pedestrian's progress through the compartment as the wings move forward.  In an emergency it is possible to (non-damaging) collapse the door's wings to the side.  Additionally, your door's custom design could have optional speakers and lights built-in to the ceiling in order for security personnel to communicate with a pedestrian and lessen any sense of panic during an emergency situation.

Q.  What are the standard and optional features of a typical IRD revolving door?

A.  Please take a look at our Design Features & More Design Features for details.

Q.  All of this sounds great.  So, how can I get more information?

A.  We were hoping you'd ask this one.  :-)  Just Contact Us anytime.

International Revolving Door Co.,  2138 N. Sixth Avenue,  Evansville, IN. 47710  USA
Tel: 1-800-745-4726  OR  1-812-425-3311       Fax:  1-812-426-2682
7AM-4PM US Central Time.
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