Add Room Mailbox Calendar Permissions in Bulk

I would like to give one administrator editor access to all Room Mailbox Calendars. I only want to grant access to the calendars and not the full mailbox.
I want to use powershell as we have a lot of Rooms but I can't find the right syntax.

Each script I look at contains something like "Room\Calendar" in it. I can't name the rooms individually.
Can someone assist me with a script to find all Room Mailboxes and assign Editor rights to the Calendar for a single user?

Thanks.
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nealerocksAsked:
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
We had a similar post but in exchange 2010. It should help you.

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/Q_28243913.html
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Rajitha ChimmaniCommented:
Try the following command

Get-Mailbox -Resultsize unlimited -RecipientTypeDetails RoomMailbox | % {Add-MailboxFolderPermission "$($_.Alias):\Calendar" -User useremailaddress -AccessRights Editor}

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nealerocksAuthor Commented:
Thank you for the suggestions. I tried the line provided by Rajitha because it seemed easier and it worked well thanks!
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