We show factorization formulas for a class of partition functions of rational six vertex model. First we show factorization formulas for partition functions under triangular boundary. Further. by combining the factorization formulas with the explicit forms of the generalized domain wall boundary partition functions by Belliard-Pimenta-Slavnov. https://safeersappliancers.shop/product-category/stoves-sterling-600df-mini-range-444440989-stainless-steel-60cm-wh/