Entryway systems - Revolving doors?

Hello Allan:

The permanent entryway system should be at least 10 feet (3 meters) long. That means none of above contribute to 10' requirement, as whole revolving area of door is considered as door. If project does not meet 10' requirement, then request for exceptions. According to LEED v4 BD+C - Exceptions to the 10-foot (3-meter) distance are allowed if the team submits documentation verifying that the proposed entryway system performs at least as well as a full-length system. Hope this helps. 

Thanks. 

I haven't had the same experience as Bipin. We've definitely been able to count systems within the door. 

In cases where the revolving door system includes a compliant entryway system, we've had success counting the path of travel within the door towards our 10'-0" minimum travel distance. We've done this by drawing the circumference of a circle at the midpoint of the door (i.e. the midpoint of the radius) as the assumed walking path and then measuring the distance along that path between the door entrance and exit (angle depends on how your door openings/exiting works). So a 3'-0" radius door gets us about 2'-6" to 4'-6" of travel distance depending on the size/position of the entrances/exits. We then have provided additional entryway systems inside of the building after existing the door to make up the remainder of the 10'-0" feet travel distance.

Allan & Bipin,

In the case of an entry vestibule, when there's walk off mat between the inner and outer door, we've seen this count toward the 10' of direction in the path of travel. It seems as though a revolving door often serves an equivalent function for both atmospheric separation and surface transition between the inside and outside.

If you Google "revolving door floor" you'll see images of some with smooth surface flooring, and some with metal grilles or walk-off mats. If the floor of the revolving door is a grille or walk mat, and the user is walking across that surface as they pass through revolving door, I would think that path of travel should contribute to the 10' distance. Would you agree?

David, 

your thought is correct, the path of travel should contribute to the length of required walk-off matt.

Hello David,

I think I missed the part that the revolving door floor had a grille. I agree with you. 

Allan,

The interpretation only says the path of travel will "exceed" the diameter of the revolving door, and not equal the circumference, so you'd need to show a scaled drawing showing the length of the the path of travel. Since that interpretation isn't listed on the Addenda tab of the credit library, it's hard to anticipate whether it would apply to a v4 project, although it would seem reasonable. Contacting LEED Coach would be a great way to get clarification.