Heb ik een schoorsteen nodig voor een pelletkachel?

<div class='gf_browser_unknown gform_wrapper' id='gform_wrapper_4' ><form method='post' enctype='multipart/form-data' id='gform_4' action='/ufaqs/5-heb-ik-een-schoorsteen-nodig-voor-een-pelletkachel/'> <div class='gform_body'><ul id='gform_fields_4' class='gform_fields top_label form_sublabel_below description_below'><li id='field_4_5' class='gfield gfield_html gfield_html_formatted gfield_no_follows_desc field_sublabel_below field_description_below gfield_visibility_visible' ><img style="max-width:100%;display:inline;border-style:solid;border-color:#ffffff;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;box-shadow:0px 0px 0px 0px #ffffff;opacity:1;width:100%" src="https://a.optmnstr.com/users/de31f09ace83/images/c858caa7ebb01545302030-popup-downloads-header.jpg" alt=""></li><li id='field_4_7' class='gfield inf-cross gfield_html gfield_html_formatted gfield_no_follows_desc field_sublabel_below field_description_below gfield_visibility_visible' ><svg viewBox="0 0 1792 1792" style="display:block;height:26px;width:26px"><path d="M1490 1322q0 40-28 68l-136 136q-28 28-68 28t-68-28l-294-294-294 294q-28 28-68 28t-68-28l-136-136q-28-28-28-68t28-68l294-294-294-294q-28-28-28-68t28-68l136-136q28-28 68-28t68 28l294 294 294-294q28-28 68-28t68 28l136 136q28 28 28 68t-28 68l-294 294 294 294q28 28 28 68z"></path></svg></li><li id='field_4_4' class='gfield gfield_html gfield_html_formatted gfield_no_follows_desc field_sublabel_below field_description_below gfield_visibility_visible' ><h3>Download Productinformatie</h3> Mis niks. Vul je naam en e-mail adres in om alle uitgebreide informatie van onze gasvrije systemen te bekijken...</li><li id='field_4_1' class='gfield gfield_contains_required field_sublabel_hidden_label field_description_below hidden_label gfield_visibility_visible' ><label class='gfield_label gfield_label_before_complex' >Voornaam<span class='gfield_required'>*</span></label><div class='ginput_complex ginput_container no_prefix has_first_name no_middle_name no_last_name no_suffix gf_name_has_1 ginput_container_name' id='input_4_1'> <span id='input_4_1_3_container' class='name_first' > <input type='text' name='input_1.3' id='input_4_1_3' value='' aria-label='Voornaam' aria-required="true" aria-invalid="false" placeholder='Vul je voornaam in'/> <label for='input_4_1_3' class='hidden_sub_label screen-reader-text'>Voornaam</label> </span> </div></li><li id='field_4_2' class='gfield gfield_contains_required field_sublabel_below field_description_below hidden_label gfield_visibility_visible' ><label class='gfield_label' for='input_4_2' >E-mailadres<span class='gfield_required'>*</span></label><div class='ginput_container ginput_container_email'> <input name='input_2' id='input_4_2' type='text' value='' class='medium' placeholder='Vul je e-mail adres in' aria-required="true" aria-invalid="false" /> </div></li><li id='field_4_6' class='gfield gform_hidden field_sublabel_below field_description_below gfield_visibility_visible' ><input name='input_6' id='input_4_6' type='hidden' class='gform_hidden' aria-invalid="false" value='' /></li><li id='field_4_8' class='gfield gform_validation_container field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_4_8' >Comments</label><div class='ginput_container'><input name='input_8' id='input_4_8' type='text' value='' /></div><div class='gfield_description' id='gfield_description_4_8'>Dit veld is bedoeld voor validatiedoeleinden en moet niet worden gewijzigd.</div></li> </ul></div> <div class='gform_footer top_label'> <input type='submit' id='gform_submit_button_4' class='gform_button button' value='Download direct' onclick='if(window["gf_submitting_4"]){return false;} window["gf_submitting_4"]=true; ' onkeypress='if( event.keyCode == 13 ){ if(window["gf_submitting_4"]){return false;} window["gf_submitting_4"]=true; jQuery("#gform_4").trigger("submit",[true]); }' /> <input type='hidden' class='gform_hidden' name='is_submit_4' value='1' /> <input type='hidden' class='gform_hidden' name='gform_submit' value='4' /> <input type='hidden' class='gform_hidden' name='gform_unique_id' value='' /> <input type='hidden' class='gform_hidden' name='state_4' value='WyJbXSIsIjA4ZjAyZDI2YTIzNGE0NjM0MjY1ZWE2YTIyMGUxOWEzIl0=' /> <input type='hidden' class='gform_hidden' name='gform_target_page_number_4' id='gform_target_page_number_4' value='0' /> <input type='hidden' class='gform_hidden' name='gform_source_page_number_4' id='gform_source_page_number_4' value='1' /> <input type='hidden' name='gform_field_values' value='' /> </div> </form> </div><script type='text/javascript'> jQuery(document).bind('gform_post_render', function(event, formId, currentPage){if(formId == 4) {if(typeof Placeholders != 'undefined'){ Placeholders.enable(); }} } );jQuery(document).bind('gform_post_conditional_logic', function(event, formId, fields, isInit){} );</script><script type='text/javascript'> jQuery(document).ready(function(){jQuery(document).trigger('gform_post_render', [4, 1]) } ); </script>