A gas flow regulator comprising • a throttle valve with a flap pivotably supported on a shaft arranged in a section of a channel inside which a gas flow is to be regulated transversely to an intended gas flow direction inside said channel, • a flap adjusting member configured to adjust the opening degree of said throttle valve by adjusting the inclination (α) of said flap with respect to a cross-section area of said channel section, • an arrangement (27, 35) configured to determine the actual gas flow rate in said channel section, • a comparison member configured to compare a value of an actual gas flow rate determined by said arrangement with a target value for said gas flow rate, and • a control device configured to control said adjusting member to pivot said flap in response to the result of said comparison for adjusting said actual gas flow rate value to be said target value, said arrangement having first means configured to measure a pressure difference of a gas flowing in said channel by sensing a gas pressure at two positions inside said channel and second means configured to calculate said actual gas flow rate inside said channel on the basis of the value of said gas pressure difference measured, said first means being configured to measure a gas pressure at two positions located directly on said flap on opposite sides thereof, one at the upstream side and one at the leeside of the flap, and has members (30, 31) defining openings (28, 29) for capturing gas and directing such an opening at said upstream side of the flap so as to receive a gas flow hitting said flap side and moving along the surface of this flap side, said flap adjusting member being configured to measure and send information about the angle of said inclination of the flap to said arrangement, said arrangement having access to gas flow rate characteristics in the form of a so-called C-factor of said throttle valve in dependence of said inclination angle (α) of the flap thereof, and which C-factor is defined as V Δp, with v=air speed inside said channel and Δp= difference of gas pressure at said two positions on opposite sides of said flap, said arrangement being configured to determine said actual gas flow rate from said pressure difference measured and said inclination angle of said flap, characterized in that at least one of said openings (28, 29) has an elongated cross-section with a width along the surface of said flap exceeding a height thereof perpendicularly from a large surface of said flap by at least 50%, and that at least one of said members (30, 31) defining the at least one of said openings (28, 29) is designed to define a channel-like member with a cross-section tapering as of said opening. • a throttle valve with a flap pivotably supported on a shaft arranged in a section of a channel inside which a gas flow is to be regulated transversely to an intended gas flow direction inside said channel, • a flap adjusting member configured to adjust the opening degree of said throttle valve by adjusting the inclination (α) of said flap with respect to a cross-section area of said channel section, • an arrangement (27, 35) configured to determine the actual gas flow rate in said channel section, • a comparison member configured to compare a value of an actual gas flow rate determined by said arrangement with a target value for said gas flow rate, and • a control device configured to control said adjusting member to pivot said flap in response to the result of said comparison for adjusting said actual gas flow rate value to be said target value,