The Danbury Planning Commission is slated to take up an application tomorrow  for a vacant warehouse and storefront on the City's westside.  Southington-based Superior Products Distributors, a construction equipment and materials supplier, is looking to move into the industrial zone.  They want to locate a full-service construction company in the former Ehrbar warehouse.  This would be the company's fifth sales and service center and applied for permission to locate a 20,000-square-foot warehouse and store on Kenosia Avenue.