In considering all appeals and all proposed variations to this chapter, the Zoning Board shall, before making any variations from the chapter in a specific case, first determine that the proposed variation will not impair an adequate supply of light and air to adjacent property, or unreasonably increase the congestion in public streets, or increase the danger of fire or endanger the public safety, or unreasonably diminish or impair established property values within the surrounding area or in any other respect impair the public health, safety, comfort, morals or welfare of the inhabitants of the City of Hometown.