Abstract: Sheet feeding equipment is provided with suction means to assist a mechanical feeder that engages the trailing edge of the bottom blank in a stack and drives this bottom blank forward through a feed slot formed between a front gauge at the front of the stack and the horizontal surface which supports the stack. The suction assist means is provided with a chamber means having communicating front, intermediate and rear portions. The intermediate portion is relatively deep and the front and rear portions are relatively shallow. A suction device is connected to the intermediate section so that air is sucked rearward through the front section through its open front end and air is sucked forward through the rear section through its open rear end to produce a Bernoulli effect which acts on the bottom sheet to draw it downward against the support surface. The front section is relatively short and is substantially shallower than the rear section so that the Bernoulli effect is specially strong at the front section.