Come in and visit our new and improved Andersen showroom! Andersen Windows is the largest window and door manufacturer in North America. The Andersen® brand is the most recognized and most used brand in the window and patio door industry. JB Sash has been a leading Andersen dealer in the Boston market for over 50 years. Our showroom displays Andersen “A” Series, 400 & 200 Series and all the product options available to our customers. Our sales staff is continually trained to completely understand the product line and will work with you to make your window and door project an easy, enjoyable experience.