Central Vacuum and Intercom Systems Suffer From Allergies? Central Vacuum Systems Have Been Proven to Aide in the Fight Against in-home Allergens. Room to Room Monitoring, Back-ground Music, and Door Answering Convenience are Just Some of the Reasons to Have an Intercom System Installed by Multi-Link Home Systems. By Adding our Dust Pan Option to Your Central Vacuum System, Your Hardwood and Tile Floors Become a Snap to Keep Clean.