allowed dry-vent fittings

I'm finding little information on what fittings are allowed for dry-vents. Drains are understandably restrictive. I need to join several dry-vents before going out the roof. Must I use Ys to connect horizontal dry-vents or can I use sanitary Ts or straight Ts? Can I connect a vertical dry-vent to an overhead horizontal dry-vent with a sanitary or straight T?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
oldee wrote:

San TEE's would be preferred in most of these cases as they provide the built-in slope for condensate drainage. Where slope is not a factor, plain TEE's can be used. WYE fittings can be use to advantage where space is limited, but there is no functional advantage over a San TEE.
Note that the inspector may have his preferences./
Jim
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.